@ARTICLE { Rsds2042,
author = {Orlowska, Ewa S. and Demri, Stephane P. and Orlowska, Ewa S.}, 
title = {Informational representability: Abstract models versus concrete models}, 
booktitle = {Fuzzy sets, Logics and Reasoning about Knowledge}, 
journal = {International Journal of Approximate Reasoning}, 
number = 	{(no. 4)}, 
pages = {301--314}, 
publisher = {Kluwer Academic Publishers}, 
address = {Dordrecht, The Netherlands}, 
year = 1999, 
editor = {Dubois, Didier and Prade, Henri}, 
keywords = {information system, incomplete information, acquisition of concepts, rough sets, }, 
}