@article{IM2_1995_59_1_a3,
     author = {Ya. Sh. Il'yasov},
     title = {On periodic non-trivial solutions of the equation $-\Delta u=g(u)$ in~$\mathbb R^{N+1}$},
     journal = {Izvestiya. Mathematics },
     pages = {101--119},
     publisher = {mathdoc},
     volume = {59},
     number = {1},
     year = {1995},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1995_59_1_a3/}
}