@article{DAN_1972_202_4_a7,
     author = {I. V. Skrypnik},
     title = {On the application of {Morse{\textquoteright}s} method to nonlinear elliptic equations},
     journal = {Doklady Akademii Nauk},
     pages = {769--771},
     publisher = {mathdoc},
     volume = {202},
     number = {4},
     year = {1972},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1972_202_4_a7/}
}