@article{ZVMMF_2010_50_1_a4,
     author = {A. A. Abramov and V. I. Ul'yanova and L. F. Yukhno},
     title = {On the general nonlinear selfadjoint spectral problem for systems of ordinary differential equations with singularities},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
     pages = {38--43},
     year = {2010},
     volume = {50},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_2010_50_1_a4/}
}