@article{SM_1993_75_1_a13,
     author = {P. E. Zhidkov},
     title = {On the existence of a~countable set of solutions in a problem of polaron theory},
     journal = {Sbornik. Mathematics},
     pages = {247--255},
     publisher = {mathdoc},
     volume = {75},
     number = {1},
     year = {1993},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1993_75_1_a13/}
}