@article{1104248199, author = {Nelson, J. E. and Regge, T.}, title = {$2+1$ gravity for genus $>1$}, journal = {Comm. Math. Phys.}, volume = {135}, number = {2}, year = {1991}, pages = { 211-223}, language = {en}, url = {http://dml.mathdoc.fr/item/1104248199} }
Nelson, J. E.; Regge, T. $2+1$ gravity for genus $>1$. Comm. Math. Phys., Tome 135 (1991) no. 2, pp. 211-223. http://gdmltest.u-ga.fr/item/1104248199/