@article{10_1017_S0017089500002913,
     author = {Robertson, Guyan},
     title = {States which have a trace-like property relative to a {C*-subalgebra} of {B(H)}},
     journal = {Glasgow mathematical journal},
     pages = {158--160},
     year = {1976},
     volume = {17},
     number = {2},
     doi = {10.1017/S0017089500002913},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089500002913/}
}