%0 Journal Article %A È. I. Kosoglyad %T Two theorems on the fourth integral of the equations of motion of a~solid body on the Lobačevskiĭ plane %J Izvestiâ vysših učebnyh zavedenij. Matematika %D 1970 %P 49-58 %N 11 %I mathdoc %U http://geodesic.mathdoc.fr/item/IVM_1970_11_a5/ %G ru %F IVM_1970_11_a5