A. Ismail, S. Jamil, A. H. Ismail, M. Ayob, and N. A. Rahim, “A Comprehensive Study of Using 2D Barcode for Multi Robot Labelling and Communication”, Int. J. Adv. Sci. Eng. Inf. Technol., vol. 2, no. 1, pp. 80–84, Feb. 2012.