@article{1103044537, author = {Philips, R. S.}, title = {The adjoint semi-group.}, journal = {Pacific J. Math.}, volume = {5}, number = {4}, year = {1955}, pages = { 269-283}, language = {en}, url = {http://dml.mathdoc.fr/item/1103044537} }
Philips, R. S. The adjoint semi-group.. Pacific J. Math., Tome 5 (1955) no. 4, pp. 269-283. http://gdmltest.u-ga.fr/item/1103044537/