@article{1102994124, author = {Brooks, J. D.}, title = {Second order dissipative operators.}, journal = {Pacific J. Math.}, volume = {19}, number = {3}, year = {1966}, pages = { 423-436}, language = {en}, url = {http://dml.mathdoc.fr/item/1102994124} }
Brooks, J. D. Second order dissipative operators.. Pacific J. Math., Tome 19 (1966) no. 3, pp. 423-436. http://gdmltest.u-ga.fr/item/1102994124/