@conference {211,
	title = {A Survey on Multi-Robot Patrolling Algorithms},
	booktitle = {Proc. of 2nd Doctoral Conference on Computing, Electrical and Industrial Systems (DoCEIS{\textquoteright}11)},
	year = {2011},
	month = {Feb.},
	address = {Costa da Caparica, Lisbon, Portugal},
	author = {Portugal, D. and Rocha, R.}
}
