@article{10_4153_CMB_1969_024_8,
     author = {Djokovi\'c, D. \v{Z}.},
     title = {On a {Class} of {Semigroups}},
     journal = {Canadian mathematical bulletin},
     pages = {213--215},
     year = {1969},
     volume = {12},
     number = {2},
     doi = {10.4153/CMB-1969-024-8},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1969-024-8/}
}