@article{1270215154,
author = {OMORI, Hideki and MAEDA, Yoshiaki and YOSHIOKA, Akira and KOBAYASHI, Osamu},
title = {On Regular Fr\'echet-Lie Groups III;
A Second Cohomology Class Related to the Lie Algebra of Pseudo-Differential Operators of Order One},
journal = {Tokyo J. of Math.},
volume = {04},
number = {2},
year = {1981},
pages = { 255-277},
language = {en},
url = {http://dml.mathdoc.fr/item/1270215154}
}
OMORI, Hideki; MAEDA, Yoshiaki; YOSHIOKA, Akira; KOBAYASHI, Osamu. On Regular Fréchet-Lie Groups III;
A Second Cohomology Class Related to the Lie Algebra of Pseudo-Differential Operators of Order One. Tokyo J. of Math., Tome 04 (1981) no. 2, pp. 255-277. http://gdmltest.u-ga.fr/item/1270215154/