@article{1102977733, author = {Showalter, R. E.}, title = {Partial differential equations of Sobolev-Galpern type.}, journal = {Pacific J. Math.}, volume = {31}, number = {3}, year = {1969}, pages = { 787-793}, language = {en}, url = {http://dml.mathdoc.fr/item/1102977733} }
Showalter, R. E. Partial differential equations of Sobolev-Galpern type.. Pacific J. Math., Tome 31 (1969) no. 3, pp. 787-793. http://gdmltest.u-ga.fr/item/1102977733/