Author: Zonalʹnoe soveshchanie-seminar zavedui͡ushchikh kafedrami i vedushchikh prepodavateleĭ matematiki vuzov Belorusskoĭ, Latviĭskoĭ, Litovskoĭ, Ėstonskoĭ SSR i Kaliningradskoĭ oblasti RSFSR (1983 Vilnius, Lithuania)