@ARTICLE { Rsds3625,
author = {Wygralak, Maciej}, 
title = {Rough sets and fuzzy sets-some remarks on interrelations}, 
journal = {Fuzzy Sets and Systems}, 
number = 	{(no. 2)}, 
volume = 29, 
pages = {241-243}, 
publisher = {Elsevier Science Inc.}, 
address = {Amsterdam, The Netherlands}, 
month = {January}, 
year = 1989, 
issn = {0165-0114}, 
abstract = {This short paper refers to two remarks given in [3] and disputes them. Any rough set can be expressed by means of a membership function U \rightarrow {0, 0.5, 1}. We show that this representation can be extended to union and intersection.}, 
keywords = {fuzzy sets, rough sets, membership functions, }, 
}