@article{SM_1967_3_4_a2,
     author = {Yu. L. Shmul'yan},
     title = {On division in the class of $J$-stretching operators},
     journal = {Sbornik. Mathematics},
     pages = {471--479},
     publisher = {mathdoc},
     volume = {3},
     number = {4},
     year = {1967},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1967_3_4_a2/}
}