@article{105283,
author = {Jaroslav Draho\v s},
title = {Modifications of closure collections},
journal = {Commentationes Mathematicae Universitatis Carolinae},
volume = {011},
year = {1970},
pages = {379-384},
zbl = {0197.18801},
mrnumber = {0266202},
language = {en},
url = {http://dml.mathdoc.fr/item/105283}
}
Drahoš, Jaroslav. Modifications of closure collections. Commentationes Mathematicae Universitatis Carolinae, Tome 011 (1970) pp. 379-384. http://gdmltest.u-ga.fr/item/105283/
Structure projective and structure inductive presheaves, Celebrazioni archimedee del secolo XX: Simposio di topologia, 1964. (1964)