@article{05066504,
title = {On representation of elements of a von Neumann algebra in the form of finite sums of products of projections.},
journal = {Sibirskij Matematicheskij Zhurnal},
volume = {46},
year = {2005},
pages = {32-45},
zbl = {1106.46045},
language = {en},
url = {http://dml.mathdoc.fr/item/05066504}
}
Bikchentaev, A.M. On representation of elements of a von Neumann algebra in the form of finite sums of products of projections.. Sibirskij Matematicheskij Zhurnal, Tome 46 (2005) pp. 32-45. http://gdmltest.u-ga.fr/item/05066504/