Ovsiannikov, L. V. (1982). Group analysis of differential equations. Academic Press.
Chicago-čujuhus (17. p.)Ovsiannikov, Lev Vasilevich. Group Analysis of Differential Equations. Nueva York: Academic Press, 1982.
MLA-čujuhus (9. p.)Ovsiannikov, Lev Vasilevich. Group Analysis of Differential Equations. Academic Press, 1982.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.