@article{JRAM_1958__200_150381,
     author = {W. Forrest Stinespring},
     title = {A {Sufficient} {Condition} for an {Integral} {Operator} to {Have} a {Trace.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {200--207},
     publisher = {mathdoc},
     volume = {200},
     year = {1958},
     zbl = {0095.09501},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1958__200_150381/}
}