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@article{JRAM_1968__232_150881, author = {R.G. Douglas}, title = {Structure theory for operators. {I.}}, journal = {Journal f\"ur die reine und angewandte Mathematik}, pages = {180--193}, publisher = {mathdoc}, volume = {232}, year = {1968}, zbl = {0164.44301}, url = {http://geodesic.mathdoc.fr/item/JRAM_1968__232_150881/} }
R.G. Douglas. Structure theory for operators. I.. Journal für die reine und angewandte Mathematik, Tome 232 (1968), pp. 180-193. http://geodesic.mathdoc.fr/item/JRAM_1968__232_150881/