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@article{IM_1988__92_1_143570, author = {D.M. Jr. Burns and C.L. Epstein}, title = {A global invariant for three dimensional {CR-manifolds.}}, journal = {Inventiones mathematicae}, pages = {333--348}, publisher = {mathdoc}, volume = {92}, number = {1}, year = {1988}, zbl = {0643.32006}, url = {http://geodesic.mathdoc.fr/item/IM_1988__92_1_143570/} }
D.M. Jr. Burns; C.L. Epstein. A global invariant for three dimensional CR-manifolds.. Inventiones mathematicae, Tome 92 (1988) no. 1, pp. 333-348. http://geodesic.mathdoc.fr/item/IM_1988__92_1_143570/