@article{AM2_1971__6_136199,
     author = {D.Z. DJOKOVIC and J.A. BAKER and J. ACZ\'EL},
     title = {Extensions of {Certain} {Homomorphisms} of {Subsemi-groups} to {Homomorphisms} of {Groups}},
     journal = {Aequationes mathematicae},
     pages = {263--271},
     publisher = {mathdoc},
     volume = {6},
     year = {1971},
     url = {http://geodesic.mathdoc.fr/item/AM2_1971__6_136199/}
}