Petrovsky, I. G. (1991). Lectures on partial differential equations. Dover.
Citazione stile Chigago Style (17a edizione)Petrovsky, Ivan Georgievich. Lectures on Partial Differential Equations. Nueva York: Dover, 1991.
Citatione MLA (9a ed.)Petrovsky, Ivan Georgievich. Lectures on Partial Differential Equations. Dover, 1991.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.