@article{MS2_1981__49_166773,
     author = {Ola Bratteli and Derek W. Robinson},
     title = {Positive {C...-semigroups} on {C*-algebras.}},
     journal = {Mathematica Scandinavica},
     pages = {259--274},
     year = {1981},
     volume = {49},
     zbl = {0485.46033},
     url = {http://geodesic.mathdoc.fr/item/MS2_1981__49_166773/}
}