@article{ZNSL_1972_27_a1,
     author = {A. Alexandrov},
     title = {Mapping of an affine space with systems of cones},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {7--16},
     publisher = {mathdoc},
     volume = {27},
     year = {1972},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1972_27_a1/}
}