@article{10_4153_CMB_1975_080_x,
     author = {Husain, T. and Khaleelulla, S. M.},
     title = {On {Countably,} \ensuremath{\sigma}-, and {Sequentially} {Barrelled} {Spaces}},
     journal = {Canadian mathematical bulletin},
     pages = {431--432},
     year = {1975},
     volume = {18},
     number = {3},
     doi = {10.4153/CMB-1975-080-x},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1975-080-x/}
}