%0 Journal Article %A M. I. Gil' %T Single-circuit systems with several nonlinearities, which satisfy %J Doklady Akademii Nauk %D 1987 %P 1315-1318 %V 292 %N 6 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1987_292_6_a8/ %G ru %F DAN_1987_292_6_a8