http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Lectures on partial differential equations
Lekt︠s︡ii ob uravnenii︠a︡kh s chastnymi proizvodnymi. Αγγλικά
I. G. Petrovsky ; translated by A. Shenitzer.
Lekt︠s︡ii ob uravnenii︠a︡kh s chastnymi proizvodnymi