@article{1103842076, author = {Hellwig, K.-E. and Kraus, K.}, title = {Operations and measurements. II}, journal = {Comm. Math. Phys.}, volume = {16}, number = {1}, year = {1970}, pages = { 142-147}, language = {en}, url = {http://dml.mathdoc.fr/item/1103842076} }
Hellwig, K.-E.; Kraus, K. Operations and measurements. II. Comm. Math. Phys., Tome 16 (1970) no. 1, pp. 142-147. http://gdmltest.u-ga.fr/item/1103842076/