@inproceedings(nguyen06mfcs, 
  author    = {Linh Anh Nguyen},
  title     = {The Data Complexity of {MDatalog} in Basic Modal Logics}, 
  booktitle = {Proceedings of MFCS 2006, LNCS 4162}, 
  editor    = {R. Kralovic and P. Urzyczyn},
  publisher = {Springer-Verlag},
  pages     = {729-740}, 
  year      = 2006)