@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/