@article{IVM_1983_6_a16,
     author = {Ya. L. Shapiro and V. A. Igoshin and E. I. Yakovlev},
     title = {Some geodesic models and an expansion theorem for second-order differential equations of the second degree},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {74--76},
     publisher = {mathdoc},
     number = {6},
     year = {1983},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1983_6_a16/}
}