@article{10_4153_CJM_1967_093_2,
     author = {Neumann, B. H.},
     title = {Some {Remarks} on {Semigroup} {Presentations}},
     journal = {Canadian journal of mathematics},
     pages = {1018--1026},
     year = {1967},
     volume = {19},
     number = {1},
     doi = {10.4153/CJM-1967-093-2},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1967-093-2/}
}