@article{AIF_2001__51_1_237_0, author = {Jakubczyk, Bronislaw and Zhitomirskii, Michail}, title = {Local reduction theorems and invariants for singular contact structures}, journal = {Annales de l'Institut Fourier}, pages = {237--295}, publisher = {Association des Annales de l{\textquoteright}institut Fourier}, volume = {51}, number = {1}, year = {2001}, doi = {10.5802/aif.1823}, zbl = {1047.53051}, mrnumber = {1821076}, language = {en}, url = {https://aif.centre-mersenne.org/articles/10.5802/aif.1823/} }