@article{SF_1989__39_2_134973,
     author = {K.D. jr. Magill},
     title = {Embedding semigroups into semigroups with countability index two.},
     journal = {Semigroup forum},
     pages = {51--58},
     publisher = {mathdoc},
     volume = {39},
     number = {2},
     year = {1989},
     zbl = {0667.20051},
     url = {http://geodesic.mathdoc.fr/item/SF_1989__39_2_134973/}
}