@article{01184332, title = {Invariants in contact topology.}, journal = {Documenta Mathematica}, year = {1998}, pages = {327-338}, zbl = {0913.53010}, language = {en}, url = {http://dml.mathdoc.fr/item/01184332} }
Eliashberg, Yakov. Invariants in contact topology.. Documenta Mathematica, (1998), pp. 327-338. http://gdmltest.u-ga.fr/item/01184332/