TY - JOUR AU - E. P. Kubishkin TI - Bifurcation of periodic solutions in the critical case of two pairs of purely imaginary roots in the presence of higher resonances JO - Differencialʹnye uravneniâ PY - 1986 SP - 1693 EP - 1697 VL - 22 IS - 10 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/DE_1986_22_10_a3/ LA - ru ID - DE_1986_22_10_a3 ER -