@article{UZMU_1956_181_181_a4,
     author = {S. B. Norkin},
     title = {Boundary problem for a second order differential equation with a retarded argument},
     journal = {Uchenye Zapiski Moskovskogo Gosudarstvennogo Universiteta},
     pages = {59--72},
     publisher = {mathdoc},
     volume = {181},
     number = {181},
     year = {1956},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/UZMU_1956_181_181_a4/}
}