@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/