@article{FAA_1981_15_4_a3,
     author = {S. P. Novikov},
     title = {Variational methods and periodic solutions of {Kirchhoff-type} equations. {II}},
     journal = {Funkcionalʹnyj analiz i ego prilo\v{z}eni\^a},
     pages = {37--52},
     publisher = {mathdoc},
     volume = {15},
     number = {4},
     year = {1981},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FAA_1981_15_4_a3/}
}