@article{DAN_1989_308_6_a1,
     author = {I. M. Gel'fand and Yu. L. Daletskii and B. L. Tsygan},
     title = {On a variant of noncommutative differential geometry},
     journal = {Doklady Akademii Nauk},
     pages = {1293--1297},
     publisher = {mathdoc},
     volume = {308},
     number = {6},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1989_308_6_a1/}
}