Lech Polkowski. A Set Theory for Rough Sets. Toward A Formal Calculus of Vague Statements. Fundamenta Informaticae, 71(1):49-61, 2006. [doi]
@article{Polkowski06:0,
title = {A Set Theory for Rough Sets. Toward A Formal Calculus of Vague Statements},
author = {Lech Polkowski},
year = {2006},
url = {http://iospress.metapress.com/openurl.asp?genre=article&issn=0169-2968&volume=71&issue=1&spage=49},
researchr = {https://researchr.org/publication/Polkowski06%3A0},
cites = {0},
citedby = {0},
journal = {Fundamenta Informaticae},
volume = {71},
number = {1},
pages = {49-61},
}