@article{KUTGS_1991_21_a9,
     author = {M. A. Malakhaltsev},
     title = {A class of manifolds over the algebra of dual numbers},
     journal = {Trudy Geometricheskogo Seminara},
     pages = {70--79},
     year = {1991},
     volume = {21},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/KUTGS_1991_21_a9/}
}