@inproceedings{inproceedingsa9330d55,
title   = {Horn clause contraction functions: belief set and belief base approaches},
author = {Delgrande, Jaime P and Wassermann, Renata},
year = {2010},
publisher = {AAAI Press},
booktitle   = {International Conference on the Principles of Knowledge Representation and Reasoning - KR}
}