@inproceedings(nguyen04cmd2, 
  author    = {Linh Anh Nguyen},
  title     = {On the Complexity of Fragments of Modal Logics},  
  booktitle = {Advances in Modal Logic - Volume 5}, 
  editor    = {Renate Schmidt and Ian Pratt-Hartmann and 
               Mark Reynolds and Heinrich Wansing}, 
  publisher = {King's College Publications}, 
  pages     = {249--268}, 
  year      = {2005})