@article{10_4153_CMB_1988_006_8,
     author = {Krystock, Robert L.},
     title = {ON {H-Sets} and {Open} {Filter} {Adherences(1)}},
     journal = {Canadian mathematical bulletin},
     pages = {37--44},
     year = {1988},
     volume = {31},
     number = {1},
     doi = {10.4153/CMB-1988-006-8},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1988-006-8/}
}