@article{DAN_1993_332_2_a5,
     author = {Ya. Sh. Ilyasov},
     title = {Existence of periodic nonnegative solutions of the equations $-\!\Delta u=g(u)$ in $\mathbb{R}^{N+1}$},
     journal = {Doklady Akademii Nauk},
     pages = {149--151},
     publisher = {mathdoc},
     volume = {332},
     number = {2},
     year = {1993},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1993_332_2_a5/}
}