Novikov, V. A.; Lar'kin, Nikolai A.; Yanenko, N. N.: О некоторых новых классах уравнений математической физики.
(Russian) [On some new classes of equations of mathematical physics].
In:
Greguš, Michal (ed.): Equadiff 5.
Proceedings of the Fifth Czechoslovak Conference on Differential Equations and Their Applications held in Bratislava, August 24-28, 1981.
BSB B.G. Teubner Verlagsgesellschaft, Leipzig, 1982.
pp. 159-164