@article{DAN_1972_204_3_a1,
     author = {S. Bogatyi},
     title = {On metric retracts},
     journal = {Doklady Akademii Nauk},
     pages = {522--524},
     publisher = {mathdoc},
     volume = {204},
     number = {3},
     year = {1972},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1972_204_3_a1/}
}