Petrovsky, I. G. (1991). Lectures on partial differential equations. Dover.
Chicago-čujuhus (17. p.)Petrovsky, Ivan Georgievich. Lectures on Partial Differential Equations. Nueva York: Dover, 1991.
MLA-čujuhus (9. p.)Petrovsky, Ivan Georgievich. Lectures on Partial Differential Equations. Dover, 1991.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.