%0 Journal Article %A Doležal, Václav %T An extension of Popov's method for vector-valued nonlinearities %J Czechoslovak Mathematical Journal %D 1965 %P 436-453 %V 15 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1965.100685/ %R 10.21136/CMJ.1965.100685 %G en %F 10_21136_CMJ_1965_100685