@article{RM_1993_48_5_a19,
     author = {E. G. Shul'geifer},
     title = {On projectivity of free objects},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {185--186},
     publisher = {mathdoc},
     volume = {48},
     number = {5},
     year = {1993},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_1993_48_5_a19/}
}