@article{1102968153, author = {Sario, Leo and Wang, Cecilia}, title = {The class of $(p,\,q)$-biharmonic functions.}, journal = {Pacific J. Math.}, volume = {43}, number = {3}, year = {1972}, pages = { 799-808}, language = {en}, url = {http://dml.mathdoc.fr/item/1102968153} }
Sario, Leo; Wang, Cecilia. The class of $(p,\,q)$-biharmonic functions.. Pacific J. Math., Tome 43 (1972) no. 3, pp. 799-808. http://gdmltest.u-ga.fr/item/1102968153/