@article{CTGDC_1978__19_3_223_0, author = {Haahti, Heikki}, title = {Compact and small rank perturbations of conformally symplectic structures}, journal = {Cahiers de topologie et g\'eom\'etrie diff\'erentielle}, pages = {223--268}, publisher = {Dunod \'editeur, publi\'e avec le concours du CNRS}, volume = {19}, number = {3}, year = {1978}, zbl = {0405.53023}, mrnumber = {546072}, language = {en}, url = {http://archive.numdam.org/item/CTGDC_1978__19_3_223_0/} }