@article{1225376785,
author = {WIERZBICKI, Jerzy},
title = {On commutativity of diagrams of type $\Pi\_{1}$ factors},
journal = {J. Math. Soc. Japan},
volume = {50},
number = {4},
year = {1998},
pages = { 23-42},
language = {en},
url = {http://dml.mathdoc.fr/item/1225376785}
}
WIERZBICKI, Jerzy. On commutativity of diagrams of type $\Pi_{1}$ factors. J. Math. Soc. Japan, Tome 50 (1998) no. 4, pp. 23-42. http://gdmltest.u-ga.fr/item/1225376785/