@article{RM_1979_34_1_a1,
     author = {S. K. Vodop'yanov and V. M. Gol'dstein and Yu. G. Reshetnyak},
     title = {On~geometric properties of~functions with generalized first derivatives},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {19--74},
     publisher = {mathdoc},
     volume = {34},
     number = {1},
     year = {1979},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_1979_34_1_a1/}
}