Coronal Holes against the Background of the Quiet Sun - Observations with the RATAN-600 in the 2-32-CM Range Borovik, V. N. ; Kurbanov, M. S. ; Livshits, M. A. ; Ryabov, B. I. Abstract Publication: Soviet Astronomy Pub Date: October 1990 Bibcode: 1990SvA....34..522B