@article{DAN_1981_257_2_a5,
     author = {S. I. Pokhozhaev},
     title = {On subordinate operators of nonlinear equations},
     journal = {Doklady Akademii Nauk},
     pages = {282--286},
     publisher = {mathdoc},
     volume = {257},
     number = {2},
     year = {1981},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1981_257_2_a5/}
}