@article{10_1017_S0017089516000045,
     author = {HIGGINS, PETER M.},
     title = {EMBEDDING {IN} {A} {FINITE} {2-GENERATOR} {SEMIGROUP}},
     journal = {Glasgow mathematical journal},
     pages = {61--75},
     year = {2017},
     volume = {59},
     number = {1},
     doi = {10.1017/S0017089516000045},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089516000045/}
}