Nikolsky S.I. ,     a.o. ,     Sinitsyna V.G. ,     Alaverdian A.Y. ,     Vorobyov S.P. High energy gamma-rays From Grab Nebula and Markarian-421 from the wide angle mirror Cherenkov teleskope SHALON at the mountain altitudes experiment SHALON-ALATOO. 24 Intern. cosmic ray conf. , Vol.2 , с. P.334-337 , 01.1995