@article{TMF_2008_157_2_a1,
     author = {M. Kh. Chankaev and A. B. Shabat},
     title = {A~nonlinear eigenvalue problem},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {175--187},
     publisher = {mathdoc},
     volume = {157},
     number = {2},
     year = {2008},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_2008_157_2_a1/}
}