@INPROCEEDINGS{Liu2007b,
  author = {Wenguo Liu and Alan F. T. Winfield and Jin Sa},
  title = {Modelling Swarm Robotic System: A Case Study in Collective Foraging},
  booktitle = {Proceeding of Towards Autonomous Robotic Systems},
  year = {2007},
  editor = {Myra S. Wilson and Fr\`{e}d\`{e}ric Labrosse and Ulrich Nehmzow and
	Chris Melhuish and Mark Witkowski},
  pages = {25 - 32},
  address = {Aberystwyth, UK},
  month = {September},
}