@article{DAN_1961_138_3_a1,
     author = {I. Ya. Bakelman},
     title = {Generalized {Chebyshev} nets and manifolds of bounded curvature},
     journal = {Doklady Akademii Nauk},
     pages = {506--507},
     publisher = {mathdoc},
     volume = {138},
     number = {3},
     year = {1961},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1961_138_3_a1/}
}