@article{IM2_1986_27_3_a6,
     author = {I. V. Savel'ev},
     title = {The structure of the set of singular points of piecewise-linear branched coverings of manifolds},
     journal = {Izvestiya. Mathematics },
     pages = {549--573},
     publisher = {mathdoc},
     volume = {27},
     number = {3},
     year = {1986},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1986_27_3_a6/}
}