@article{10_4153_CMB_1976_036_7,
     author = {Wong, James C. S.},
     title = {Amenability and {Substantial} {Semigroups}},
     journal = {Canadian mathematical bulletin},
     pages = {231--234},
     year = {1976},
     volume = {19},
     number = {2},
     doi = {10.4153/CMB-1976-036-7},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1976-036-7/}
}