TY JOUR TI Some problems of invalidating a will on the basis of ยง 1 of article 177 of the Civil Code of the Russian Federation KW testament KW vice of will KW transaction KW forensic examination KW expert opinion KW secrecy of the will JO Vestnik of the St. Petersburg University of the Ministry of Internal Affairs of Russia AU Takhmazov, E.S. PY 2022 IS 2022 PB SAINT-PETERSBURG UNIVERSITY OF THE MINISTRY OF INTERNAL AFFAIRS OF THE RUSSIAN FEDERATION