L. Hric et R. Galis, New periods of variable stars in Cygnus based on a quarter of century of photographic observations, ASTR AST SS, 135(1), 1999, pp. 29-40
This work summarizes the results of photographic photometry obtained over 2
4 years at the Skalnate Pleso (1979-1993) and Asiago (1969-1988) observator
ies. The period of light changes, the epoch of the maximum or of the minimu
m, the type of variability and, in some cases, possible causes of the long-
term behaviour of light changes were determined for 17 variable stars.