@article{DAN_1961_138_2_a14,
     author = {S. I. Pokhozhaev},
     title = {Boundary value problem for equation $\Delta U=U^2$},
     journal = {Doklady Akademii Nauk},
     pages = {305--308},
     publisher = {mathdoc},
     volume = {138},
     number = {2},
     year = {1961},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1961_138_2_a14/}
}