%0 Journal Article %A È. M. Solnechnyi %T Points of stationarity of functionals of the type of the action integral of a~conservative system %J Izvestiâ vysših učebnyh zavedenij. Matematika %D 1971 %P 96-101 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/IVM_1971_2_a12/ %G ru %F IVM_1971_2_a12