@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/}
}