@article{SF_1992__45_3_135166,
     author = {I. Levi},
     title = {Injective endomorphisms of {Gx-normal} semigroups: {Infinite} defects.},
     journal = {Semigroup forum},
     pages = {9--22},
     publisher = {mathdoc},
     volume = {45},
     number = {3},
     year = {1992},
     zbl = {0787.20038},
     url = {http://geodesic.mathdoc.fr/item/SF_1992__45_3_135166/}
}