@article{CMFD_2010_36_a6,
     author = {Ya. M. Dymarskii and D. N. Nepiypa},
     title = {A quasilinear method in the theory of small eigenfunctions for nonlinear periodic boundary-value problems},
     journal = {Contemporary Mathematics. Fundamental Directions},
     pages = {72--86},
     publisher = {mathdoc},
     volume = {36},
     year = {2010},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/CMFD_2010_36_a6/}
}