@article{10_4153_CJM_1977_127_6,
     author = {Chattopadhyay, K. C. and Thron, W. J.},
     title = {Extensions of {Closure} {Spaces}},
     journal = {Canadian journal of mathematics},
     pages = {1277--1286},
     year = {1977},
     volume = {29},
     number = {6},
     doi = {10.4153/CJM-1977-127-6},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1977-127-6/}
}