@ARTICLE { Rsds3608,
author = {Zhang, Wen-Xiu and Mi, Ju-Sheng and Wu, Wei-Zhi}, 
title = {Generalized fuzzy rough sets}, 
journal = {Information Sciences: An International Journal}, 
volume = 151, 
pages = {263-282}, 
publisher = {Elsevier Science Inc.}, 
address = {Amsterdam, The Netherlands}, 
month = {May}, 
year = 2003, 
issn = {0020-0255}, 
abstract = {This paper presents a general framework for the study of fuzzy rough sets in which both constructive and axiomatic approaches are used. In constructive approach, a pair of lower and upper generalized approximation operators is defined. The connections between fuzzy relations and fuzzy rough approximation operators are examined. In axiomatic approach, various classes of fuzzy rough approximation operators are characterized by different sets of axioms. Axioms of fuzzy approximation operators guarantee the existence of certain types of fuzzy relations producing the same operators.}, 
keywords = {approximation operators, fuzzy relations, fuzzy rough sets, rough sets, }, 
}