G. Ansa, E. Johnson, H. Cruickshank, and Z. Sun. PSATS, volume 43 of Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering, page 221-234. Springer, (2010)
G. Ansa, H. Cruickshank, and Z. Sun. PSATS, volume 71 of Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering, page 213-226. Springer, (2011)
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