@article{PORMA_1965__24_1_114937,
     author = {Henney, Dagmar R.},
     title = {N-parameter semigroups},
     journal = {Portugaliae mathematica},
     pages = {31--37},
     publisher = {mathdoc},
     volume = {24},
     number = {1},
     year = {1965},
     mrnumber = {0195981},
     zbl = {0139.06803},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PORMA_1965__24_1_114937/}
}