@article{1103038897, author = {Protter, M. H.}, title = {Vibration of a nonhomogeneous membrane.}, journal = {Pacific J. Math.}, volume = {9}, number = {4}, year = {1959}, pages = { 1249-1255}, language = {en}, url = {http://dml.mathdoc.fr/item/1103038897} }
Protter, M. H. Vibration of a nonhomogeneous membrane.. Pacific J. Math., Tome 9 (1959) no. 4, pp. 1249-1255. http://gdmltest.u-ga.fr/item/1103038897/