@article{SM_1967_3_1_a9,
     author = {M. S. Burgin},
     title = {Imbedding of an amalgam of groups with a certain property into a group with the same property},
     journal = {Sbornik. Mathematics},
     pages = {139--151},
     publisher = {mathdoc},
     volume = {3},
     number = {1},
     year = {1967},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1967_3_1_a9/}
}