@article{DAN_1969_188_4_a2,
     author = {I. V. Dolgachev},
     title = {On the purity of the set of singular points of a morphism of schemes},
     journal = {Doklady Akademii Nauk},
     pages = {742--744},
     publisher = {mathdoc},
     volume = {188},
     number = {4},
     year = {1969},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1969_188_4_a2/}
}