@article{1103857593, author = {Neumann, Holger}, title = {Classical systems and observables in quantum mechanics}, journal = {Comm. Math. Phys.}, volume = {20}, number = {1}, year = {1971}, pages = { 100-116}, language = {en}, url = {http://dml.mathdoc.fr/item/1103857593} }
Neumann, Holger. Classical systems and observables in quantum mechanics. Comm. Math. Phys., Tome 20 (1971) no. 1, pp. 100-116. http://gdmltest.u-ga.fr/item/1103857593/