@ARTICLE{2011A&A...535A..14K,
       author = {{Kiselman}, D. and {Pereira}, T.~M.~D. and {Gustafsson}, B. and {Asplund}, M. and {Mel{\'e}ndez}, J. and {Langhans}, K.},
        title = "Is the solar spectrum latitude-dependent?. An investigation with SST/TRIPPEL",
      journal = {\aap},
         year = 2011,
       volume = {535},
          eid = {A14},
        pages = {A14},
          doi = {10.1051/0004-6361/201117553},
archivePrefix = {arXiv},
       eprint = {1108.4527},
 primaryClass = {astro-ph.SR},
       adsurl = {https://ui.adsabs.harvard.edu/abs/2011A&A...535A..14K},
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@ARTICLE{2010ApJ...725...11B,
       author = {{Bellot Rubio}, L.~R. and {Schlichenmaier}, R. and {Langhans}, K.},
        title = "Searching for Overturning Convection in Penumbral Filaments: Slit Spectroscopy at 0farcs2 Resolution",
      journal = {\apj},
         year = 2010,
       volume = {725},
       number = {1},
        pages = {11-16},
          doi = {10.1088/0004-637X/725/1/11},
archivePrefix = {arXiv},
       eprint = {1009.5650},
 primaryClass = {astro-ph.SR},
       adsurl = {https://ui.adsabs.harvard.edu/abs/2010ApJ...725...11B},
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@INPROCEEDINGS{2007ASPC..369...71S,
       author = {{Scharmer}, G.~B. and {Langhans}, K. and {Kiselman}, D. and {L{\"o}fdahl}, M.~G.},
        title = "Recent High Resolution Observations and Interpretations of Sunspot Fine Structure",
    booktitle = {New Solar Physics with Solar-B Mission},
         year = 2007,
       editor = {{Shibata}, K. and {Nagata}, S. and {Sakurai}, T.},
       series = {Astron.\ Soc.\ Pacific Conf.\ Ser.},
       volume = {369},
        pages = {71},
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@ARTICLE{2007A&A...464..763L,
       author = {{Langhans}, K. and {Scharmer}, G.~B. and {Kiselman}, D. and {L{\"o}fdahl}, M.~G.},
        title = "Observations of dark-cored filaments in sunspot penumbrae",
      journal = {\aap},
         year = 2007,
       volume = {464},
       number = {2},
        pages = {763-774},
          doi = {10.1051/0004-6361:20065215},
       adsurl = {https://ui.adsabs.harvard.edu/abs/2007A&A...464..763L},
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@INPROCEEDINGS{2006ASPC..358....3L,
       author = {{Langhans}, K.},
        title = "Signatures of Penumbral Magnetic Fields at Very High Spatial Resolution",
    booktitle = {Solar Polarization 4},
         year = 2006,
       editor = {{Casini}, R. and {Lites}, B.~W.},
       series = {Astron.\ Soc.\ Pacific Conf.\ Ser.},
       volume = {358},
        pages = {3},
       adsurl = {https://ui.adsabs.harvard.edu/abs/2006ASPC..358....3L},
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@ARTICLE{2005A&A...443L...7B,
       author = {{Bellot Rubio}, L.~R. and {Langhans}, K. and {Schlichenmaier}, R.},
        title = "Multi-line spectroscopy of dark-cored penumbral filaments",
      journal = {\aap},
         year = 2005,
       volume = {443},
       number = {1},
        pages = {L7-L10},
          doi = {10.1051/0004-6361:200500179},
       adsurl = {https://ui.adsabs.harvard.edu/abs/2005A&A...443L...7B},
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@ARTICLE{2005A&A...436.1087L,
       author = {{Langhans}, K. and {Scharmer}, G.~B. and {Kiselman}, D. and {L{\"o}fdahl}, M.~G. and {Berger}, T.~E.},
        title = "Inclination of magnetic fields and flows in sunspot penumbrae",
      journal = {\aap},
         year = 2005,
       volume = {436},
       number = {3},
        pages = {1087-1101},
          doi = {10.1051/0004-6361:20052678},
       adsurl = {https://ui.adsabs.harvard.edu/abs/2005A&A...436.1087L},
      adsnote = {Provided by the SAO/NASA Astrophysics Data System}
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@ARTICLE{2004A&A...423.1147L,
       author = {{Langhans}, K. and {Schmidt}, W. and {Rimmele}, T.},
        title = "Diagnostic spectroscopy of G-band brightenings in the photosphere of the sun",
      journal = {\aap},
         year = 2004,
       volume = {423},
        pages = {1147-1157},
          doi = {10.1051/0004-6361:20035879},
       adsurl = {https://ui.adsabs.harvard.edu/abs/2004A&A...423.1147L},
      adsnote = {Provided by the SAO/NASA Astrophysics Data System}
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@ARTICLE{2003ANS...324...54L,
       author = {{Langhans}, K. and {Schmidt}, W. and {Tritschler}, A.},
        title = "Two-dimensional Spectroscopy of G-band Bright Structures in the Solar Photosphere",
      journal = {Astronomische Nachrichten Supplement},
         year = 2003,
       volume = {324},
       number = {2},
        pages = {54},
       adsurl = {https://ui.adsabs.harvard.edu/abs/2003ANS...324...54L},
      adsnote = {Provided by the SAO/NASA Astrophysics Data System}
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@ARTICLE{2003AN....324..354L,
       author = {{Langhans}, K. and {Schmidt}, W. and {Tritschler}, A.},
        title = "Observations of G-band bright structures with TESOS",
      journal = {Astronomische Nachrichten},
         year = 2003,
       volume = {324},
       number = {4},
        pages = {354},
          doi = {10.1002/asna.200310124},
       adsurl = {https://ui.adsabs.harvard.edu/abs/2003AN....324..354L},
      adsnote = {Provided by the SAO/NASA Astrophysics Data System}
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@ARTICLE{2002SoPh..211...17T,
       author = {{Tritschler}, A. and {Schmidt}, W. and {Langhans}, K. and {Kentischer}, T.},
        title = "High-resolution solar spectroscopy with TESOS - Upgrade from a double to a triple system",
      journal = {\solphys},
         year = 2002,
       volume = {211},
       number = {1},
        pages = {17-29},
          doi = {10.1023/A:1022459132089},
       adsurl = {https://ui.adsabs.harvard.edu/abs/2002SoPh..211...17T},
      adsnote = {Provided by the SAO/NASA Astrophysics Data System}
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@INPROCEEDINGS{2002ESASP.506..455L,
       author = {{Langhans}, K. and {Schmidt}, W. and {Tritschler}, A.},
        title = "2D-spectroscopic observations of G-band bright structures",
    booktitle = {Solar Variability: From Core to Outer Frontiers},
         year = 2002,
       editor = {{Wilson}, A.},
       series = {ESA Special Publication},
       volume = {1},
        pages = {455-456},
       adsurl = {https://ui.adsabs.harvard.edu/abs/2002ESASP.506..455L},
      adsnote = {Provided by the SAO/NASA Astrophysics Data System}
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@INPROCEEDINGS{2002ESASP.506..397L,
       author = {{Langhans}, K. and {Schmidt}, W. and {Rimmele}, T.},
        title = "Spectroscopic observations of G-band bright points",
    booktitle = {Solar Variability: From Core to Outer Frontiers},
         year = 2002,
       editor = {{Wilson}, A.},
       series = {ESA Special Publication},
       volume = {1},
        pages = {397-400},
       adsurl = {https://ui.adsabs.harvard.edu/abs/2002ESASP.506..397L},
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@ARTICLE{2002A&A...394.1069L,
       author = {{Langhans}, K. and {Schmidt}, W. and {Tritschler}, A.},
        title = "2D-spectroscopic observations of vec G-band bright structures in the solar photosphere",
      journal = {\aap},
         year = 2002,
       volume = {394},
        pages = {1069-1076},
          doi = {10.1051/0004-6361:20021196},
       adsurl = {https://ui.adsabs.harvard.edu/abs/2002A&A...394.1069L},
      adsnote = {Provided by the SAO/NASA Astrophysics Data System}
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@ARTICLE{2002A&A...382..312L,
       author = {{Langhans}, K. and {Schmidt}, W.},
        title = "Center-to-limb-variation of the G-band lines at 430.5 nm",
      journal = {\aap},
         year = 2002,
       volume = {382},
        pages = {312-318},
          doi = {10.1051/0004-6361:20011582},
       adsurl = {https://ui.adsabs.harvard.edu/abs/2002A&A...382..312L},
      adsnote = {Provided by the SAO/NASA Astrophysics Data System}
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@INPROCEEDINGS{2001ASPC..236..439L,
       author = {{Langhans}, K. and {Schmidt}, W. and {Rimmele}, T. and {Sigwarth}, M.},
        title = "Spectroscopic Observation of G-Band Bright Points",
    booktitle = {Advanced Solar Polarimetry -- Theory, Observation, and Instrumentation},
         year = 2001,
       editor = {{Sigwarth}, Michael},
       series = {Astron.\ Soc.\ Pacific Conf.\ Ser.},
       volume = {236},
        pages = {439},
       adsurl = {https://ui.adsabs.harvard.edu/abs/2001ASPC..236..439L},
      adsnote = {Provided by the SAO/NASA Astrophysics Data System}
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