@article{IVM_1970_11_a5,
     author = {\`E. I. Kosoglyad},
     title = {Two theorems on the fourth integral of the equations of motion of a~solid body on the {Loba\v{c}evski\u{i}} plane},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {49--58},
     publisher = {mathdoc},
     number = {11},
     year = {1970},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1970_11_a5/}
}