@article{GDZPPN002201127,
title = {Structure and unitary cocycle representations of loop groups and the group of diffeomorphisms of the circle.},
journal = {Journal f\"ur die reine und angewandte Mathematik},
volume = {346},
year = {1984},
pages = {69-133},
zbl = {0514.22012},
url = {http://dml.mathdoc.fr/item/GDZPPN002201127}
}
Wallach, Nolan R.; Goodman, Roe. Structure and unitary cocycle representations of loop groups and the group of diffeomorphisms of the circle.. Journal für die reine und angewandte Mathematik, Tome 346 (1984) pp. 69-133. http://gdmltest.u-ga.fr/item/GDZPPN002201127/