@article{IVM_1984_4_a18,
     author = {L. A. Matevosyan},
     title = {Path surfaces of composition of {Riemannian} spaces},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {78--80},
     publisher = {mathdoc},
     number = {4},
     year = {1984},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1984_4_a18/}
}