@article{IIMI_2015_2_a4,
     author = {M. Yu. Vatolkin},
     title = {On the eigenfunctions and eigenvalues of a quasidifferential second order boundary value problem},
     journal = {Izvestiya Instituta Matematiki i Informatiki Udmurtskogo Gosudarstvennogo Universiteta},
     pages = {38--44},
     year = {2015},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IIMI_2015_2_a4/}
}