@article{LJM_1999_4_a1,
     author = {H. Omori},
     title = {Introduction to noncommutative differential geometry},
     journal = {Lobachevskii journal of mathematics},
     pages = {13--46},
     year = {1999},
     volume = {4},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/LJM_1999_4_a1/}
}