@article{IVM_1960_4_a22,
     author = {E. S. Chichkin},
     title = {A~non-oscillation theorem for a~linear self-adjoint differential equation of fourth order},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {206--209},
     publisher = {mathdoc},
     number = {4},
     year = {1960},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1960_4_a22/}
}