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@article{PORMA_1962__21_3_114890, author = {Miller, Donald W.}, title = {Hamiltonian semigroups}, journal = {Portugaliae mathematica}, pages = {171--187}, publisher = {mathdoc}, volume = {21}, number = {3}, year = {1962}, mrnumber = {0146278}, zbl = {0111.03802}, language = {en}, url = {http://geodesic.mathdoc.fr/item/PORMA_1962__21_3_114890/} }
Miller, Donald W. Hamiltonian semigroups. Portugaliae mathematica, Tome 21 (1962) no. 3, pp. 171-187. http://geodesic.mathdoc.fr/item/PORMA_1962__21_3_114890/