@article{1103858405, author = {Herman, Richard H.}, title = {Perturbations of the modular automorphism group}, journal = {Comm. Math. Phys.}, volume = {24}, number = {2}, year = {1972}, pages = { 237-243}, language = {en}, url = {http://dml.mathdoc.fr/item/1103858405} }
Herman, Richard H. Perturbations of the modular automorphism group. Comm. Math. Phys., Tome 24 (1972) no. 2, pp. 237-243. http://gdmltest.u-ga.fr/item/1103858405/