@article{SM_1970_12_4_a8,
     author = {Yu. A. Volkov and B. V. Dekster},
     title = {Estimates of the curvature of a~three-dimensional evolute},
     journal = {Sbornik. Mathematics},
     pages = {615--637},
     publisher = {mathdoc},
     volume = {12},
     number = {4},
     year = {1970},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1970_12_4_a8/}
}