@article{GDZPPN002434040, title = {On the Curvature of CR-Structures and its Covariant Derivatives.}, journal = {Mathematische Zeitschrift}, volume = {194}, year = {1987}, pages = {203-210}, url = {http://dml.mathdoc.fr/item/GDZPPN002434040} }
Cheng, Jih-Hsin. On the Curvature of CR-Structures and its Covariant Derivatives.. Mathematische Zeitschrift, Tome 194 (1987) pp. 203-210. http://gdmltest.u-ga.fr/item/GDZPPN002434040/