@article{ZVMMF_2002_42_7_a6,
     author = {A. A. Abramov and K. Balla and V. I. Ul'yanova and L. F. Yukhno},
     title = {On a nonlinear selfadjoint spectral problem for some differential-algebraic equations of index~$1$},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
     pages = {996--1012},
     publisher = {mathdoc},
     volume = {42},
     number = {7},
     year = {2002},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_2002_42_7_a6/}
}