@ARTICLE { Rsds251,
author = {Liau, Churn-Jung}, 
title = {An overview of rough set semantics for modal and quantifier logics}, 
journal = {International Journal Uncertainty, Fuzziness and Knowledge-Based System}, 
number = 	{(no. 1)}, 
volume = 8, 
pages = {93-118}, 
publisher = {World Scientific Publishing Company}, 
month = {February}, 
year = 2000, 
keywords = {epistemic logic, modal logic, }, 
}