@article{10_4153_CMB_1976_045_6,
     author = {Kannappan, Pl. and Taylor, M. A.},
     title = {On {Closure} {Conditions}},
     journal = {Canadian mathematical bulletin},
     pages = {291--296},
     year = {1976},
     volume = {19},
     number = {3},
     doi = {10.4153/CMB-1976-045-6},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1976-045-6/}
}