@article{AIHPA_1978__29_1_123_0,
     author = {Vanheuverzwijn, P.},
     title = {Generators for quasi-free completely positive semi-groups},
     journal = {Annales de l'I.H.P. Physique th\'eorique},
     pages = {123--138},
     publisher = {Gauthier-Villars},
     volume = {29},
     number = {1},
     year = {1978},
     mrnumber = {512427},
     zbl = {0398.47029},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AIHPA_1978__29_1_123_0/}
}