@article{JRAM_1989__393_153089,
     author = {R.A. Lorentz and W.P. Kamp and P.A. Rejto},
     title = {On a theorem of {Stinespring} concerning integral operators of trace class.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {1--20},
     publisher = {mathdoc},
     volume = {393},
     year = {1989},
     zbl = {0659.45013},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1989__393_153089/}
}