Bits of information about the participation GA Belousko in various exhibitions are on maslovka.org, for example:
http://maslovka.info/modules.php?nam...15&page=14
http://maslovka.org/modules.php?name...7&page=132
http://maslovka.info/modules.php?nam...534&page=2
If the interest is not an idle question - contact Pskov Academic Theater. Pushkin, in connection with productions which GA Belousko mentioned as a theater artist in the 50-60-e. Good luck!