@article{IVM_2003_9_a11,
     author = {N. V. Chiganova},
     title = {The eigenvalue problem for an equation of mixed type with two lines of degeneracy},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {67--73},
     publisher = {mathdoc},
     number = {9},
     year = {2003},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_2003_9_a11/}
}