FAIGL, J. Approximate Solution of the Multiple Watchman Routes Problem With Restricted Visibility Range. IEEE Transactions on Neural Networks. 2010, 21(10), 1668-1679. ISSN 1045-9227. DOI 10.1109/TNN.2010.2070518.
URL: http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5567166