@article{1102868243, author = {Piech, M. Ann}, title = {Locality of the number of particles operator.}, journal = {Pacific J. Math.}, volume = {61}, number = {2}, year = {1975}, pages = { 259-262}, language = {en}, url = {http://dml.mathdoc.fr/item/1102868243} }
Piech, M. Ann. Locality of the number of particles operator.. Pacific J. Math., Tome 61 (1975) no. 2, pp. 259-262. http://gdmltest.u-ga.fr/item/1102868243/