Sunspots
  - J.Staude, F.Furstenberg, J.Hildebrandt, A.Kruger, J.Jakimiec, V.N.Obridko, M.Siarkowski, B.Sylwester, L.Sylwester
 
  A working model of sunspot structure in photosphere, chromosphere, and corona derived from X-ray, EUV, optical, and radio observations 
  Acta Astronomica, 1983, v. 33, No. 3-4, pp. 441-460 
 
  - J.Staude, F.Furstenberg, J.Hildebrandt, A.Kruger, J.Jakimiec, V.N.Obridko, M.Siarkowski, B.Sylwester, L.Sylwester
 
  The atmosphere of a sunspot based on observations in the X-ray, extreme ultraviolet, optical, and radio ranges 
  Soviet Astronomy, 1984, v. 28, No. 5, pp. 557-563 
 
 
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