@inproceedings(nguyen05clima, 
  author      = {Linh Anh Nguyen}, 
  title       = {Reasoning about Epistemic States of Agents 
                 by Modal Logic Programming}, 
  booktitle   = {Proceedings of CLIMA VI, LNAI 3900}, 
  editor      = {F. Toni and P. Torroni}, 
  publisher   = {Springer-Verlag}, 
  pages       = {37-56},
  year        = 2006)