@article{ZNSL_1993_205_a6,
     author = {P. P. Kulish},
     title = {Covariant noncommutative differential geometry},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {85--91},
     year = {1993},
     volume = {205},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1993_205_a6/}
}