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%Please cite the following publication to acknowledge GREGOR and GRIS.
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@ARTICLE{2012AN....333..796S,
   author = {{Schmidt}, W. and {von der L{\"u}he}, O. and {Volkmer}, R. and 
	{Denker}, C. and {Solanki}, S.~K. and {Balthasar}, H. and {Bello Gonzalez}, N. and 
	{Berkefeld}, T. and {Collados}, M. and {Fischer}, A. and {Halbgewachs}, C. and 
	{Heidecke}, F. and {Hofmann}, A. and {Kneer}, F. and {Lagg}, A. and 
	{Nicklas}, H. and {Popow}, E. and {Puschmann}, K.~G. and {Schmidt}, D. and 
	{Sigwarth}, M. and {Sobotka}, M. and {Soltau}, D. and {Staude}, J. and 
	{Strassmeier}, K.~G. and {Waldmann }, T.~A.},
    title = "{The 1.5 meter solar telescope GREGOR}",
  journal = {Astronomische Nachrichten},
 keywords = {instrumentation: high angular resolution, Sun: magnetic fields, telescopes},
     year = 2012,
    month = nov,
   volume = 333,
    pages = {796},
      doi = {10.1002/asna.201211725},
   adsurl = {http://adsabs.harvard.edu/abs/2012AN....333..796S},
  adsnote = {Provided by the SAO/NASA Astrophysics Data System}
}

@ARTICLE{2012AN....333..863B,
   author = {{Berkefeld }, T. and {Schmidt}, D. and {Soltau}, D. and {von der L{\"u}he}, O. and 
	{Heidecke}, F.},
    title = "{The GREGOR adaptive optics system}",
  journal = {Astronomische Nachrichten},
 keywords = {atmospheric effects, instrumentation: adaptive optics, instrumentation: high angular resolution, Sun: general, telescopes},
     year = 2012,
    month = nov,
   volume = 333,
    pages = {863},
      doi = {10.1002/asna.201211739},
   adsurl = {http://adsabs.harvard.edu/abs/2012AN....333..863B},
  adsnote = {Provided by the SAO/NASA Astrophysics Data System}
}

@ARTICLE{2012AN....333..872C,
   author = {{Collados}, M. and {L{\'o}pez}, R. and {P{\'a}ez}, E. and {Hern{\'a}ndez}, E. and 
	{Reyes}, M. and {Calcines}, A. and {Ballesteros}, E. and {D{\'{\i}}az}, J.~J. and 
	{Denker}, C. and {Lagg}, A. and {Schlichenmaier}, R. and {Schmidt}, W. and 
	{Solanki}, S.~K. and {Strassmeier}, K.~G. and {von der L{\"u}he}, O. and 
	{Volkmer}, R.},
    title = "{GRIS: The GREGOR Infrared Spectrograph}",
  journal = {Astronomische Nachrichten},
 keywords = {instrumentation: spectrographs, techniques: spectroscopic, telescopes},
     year = 2012,
    month = nov,
   volume = 333,
    pages = {872},
      doi = {10.1002/asna.201211738},
   adsurl = {http://adsabs.harvard.edu/abs/2012AN....333..872C},
  adsnote = {Provided by the SAO/NASA Astrophysics Data System}
}

@ARTICLE{2016A&A...596A...2B,
   author = {{Borrero}, J.~M. and {Asensio Ramos}, A. and {Collados}, M. and 
	{Schlichenmaier}, R. and {Balthasar}, H. and {Franz}, M. and 
	{Rezaei}, R. and {Kiess}, C. and {Orozco Su{\'a}rez}, D. and 
	{Pastor}, A. and {Berkefeld}, T. and {von der L{\"u}he}, O. and 
	{Schmidt}, D. and {Schmidt}, W. and {Sigwarth}, M. and {Soltau}, D. and 
	{Volkmer}, R. and {Waldmann}, T. and {Denker}, C. and {Hofmann}, A. and 
	{Staude}, J. and {Strassmeier}, K.~G. and {Feller}, A. and {Lagg}, A. and 
	{Solanki}, S.~K. and {Sobotka}, M. and {Nicklas}, H.},
    title = "{Deep probing of the photospheric sunspot penumbra: no evidence of field-free gaps}",
  journal = {\aap},
archivePrefix = "arXiv",
   eprint = {1607.08165},
 primaryClass = "astro-ph.SR",
 keywords = {sunspots, Sun: infrared, Sun: photosphere, Sun: magnetic fields},
     year = 2016,
    month = nov,
   volume = 596,
      eid = {A2},
    pages = {A2},
      doi = {10.1051/0004-6361/201628313},
   adsurl = {http://adsabs.harvard.edu/abs/2016A%26A...596A...2B},
  adsnote = {Provided by the SAO/NASA Astrophysics Data System}
}

@ARTICLE{2016A&A...596A...4F,
   author = {{Franz}, M. and {Collados}, M. and {Bethge}, C. and {Schlichenmaier}, R. and 
	{Borrero}, J.~M. and {Schmidt}, W. and {Lagg}, A. and {Solanki}, S.~K. and 
	{Berkefeld}, T. and {Kiess}, C. and {Rezaei}, R. and {Schmidt}, D. and 
	{Sigwarth}, M. and {Soltau}, D. and {Volkmer}, R. and {von der Luhe}, O. and 
	{Waldmann}, T. and {Orozco}, D. and {Pastor Yabar}, A. and {Denker}, C. and 
	{Balthasar}, H. and {Staude}, J. and {Hofmann}, A. and {Strassmeier}, K. and 
	{Feller}, A. and {Nicklas}, H. and {Kneer}, F. and {Sobotka}, M.
	},
    title = "{Magnetic fields of opposite polarity in sunspot penumbrae}",
  journal = {\aap},
archivePrefix = "arXiv",
   eprint = {1608.00513},
 primaryClass = "astro-ph.SR",
 keywords = {sunspots, Sun: infrared, Sun: photosphere, Sun: magnetic fields},
     year = 2016,
    month = nov,
   volume = 596,
      eid = {A4},
    pages = {A4},
      doi = {10.1051/0004-6361/201628407},
   adsurl = {http://adsabs.harvard.edu/abs/2016A%26A...596A...4F},
  adsnote = {Provided by the SAO/NASA Astrophysics Data System}
}

@ARTICLE{2011SoPh..273..267B,
       author = {{Borrero}, J.~M. and {Tomczyk}, S. and {Kubo}, M. and {Socas-Navarro}, H. and {Schou}, J. and {Couvidat}, S. and {Bogart}, R.},
        title = "{VFISV: Very Fast Inversion of the Stokes Vector for the Helioseismic and Magnetic Imager}",
      journal = {\solphys},
     keywords = {Magnetic Fields, Photosphere, Astrophysics - Instrumentation and Methods for Astrophysics, Astrophysics - Solar and Stellar Astrophysics},
         year = 2011,
        month = oct,
       volume = {273},
       number = {1},
        pages = {267-293},
          doi = {10.1007/s11207-010-9515-6},
archivePrefix = {arXiv},
       eprint = {0901.2702},
 primaryClass = {astro-ph.IM},
       adsurl = {https://ui.adsabs.harvard.edu/abs/2011SoPh..273..267B},
      adsnote = {Provided by the SAO/NASA Astrophysics Data System}
}