Calculus of Variations and Partial Differential Equations. Springer Berlin Heidelberg.
Chicago-čujuhus (17. p.)Calculus of Variations and Partial Differential Equations. Springer Berlin Heidelberg.
MLA-čujuhus (9. p.)Calculus of Variations and Partial Differential Equations. Springer Berlin Heidelberg.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.