@article{UZKU_1965_125_2_a9,
     author = {A. D. Lyashko},
     title = {The variational method for nonlinear operator equations},
     journal = {U\v{c}\"enye zapiski Kazanskogo universiteta. Seri\^a Fiziko-matemati\v{c}eskie nauki},
     pages = {95--101},
     publisher = {mathdoc},
     volume = {125},
     number = {2},
     year = {1965},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/UZKU_1965_125_2_a9/}
}