Vklad politechnikov Petrograda-Leningrada-Peterburga v rešenie problem kompleksnogo ispolʹzovanija prirodnych resursov = The role of the employees of the Polytechnic University of Petrograd-Leningrad-Petersburg in solving the problems of the integrated use of natural resources - Vasilʹev, Jurij Sergeevič 1939-; Poltorak, Sergej Nikolaevič 1955- (2019)