Ovsiannikov, L. V. (1982). Group analysis of differential equations. Academic Press.
Citazione stile Chigago Style (17a edizione)Ovsiannikov, Lev Vasilevich. Group Analysis of Differential Equations. Nueva York: Academic Press, 1982.
Citatione MLA (9a ed.)Ovsiannikov, Lev Vasilevich. Group Analysis of Differential Equations. Academic Press, 1982.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.