TY - JOUR AU - Ya. Sh. Il'yasov TI - On periodic non-trivial solutions of the equation $-\Delta u=g(u)$ in~$\mathbb R^{N+1}$ JO - Izvestiya. Mathematics PY - 1995 SP - 101 EP - 119 VL - 59 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/IM2_1995_59_1_a3/ LA - en ID - IM2_1995_59_1_a3 ER -