D. Stewart, D. Erbech, and H. Shubin. AFIPS Fall Joint Computing Conference (1), volume 33 of AFIPS Conference Proceedings, page 797-807. AFIPS / ACM / Thomson Book Company, Washington D.C., (1968)
S. Sacks, N. Palley, H. Shubin, and A. Afifi. AFIPS Fall Joint Computing Conference, volume 37 of AFIPS Conference Proceedings, page 609-614. AFIPS / ACM, (1970)
H. Hao, L. Ruan, L. Xiao, S. Su, F. Yuan, H. Wang, and J. Liu. CollaborateCom, volume 252 of Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering, page 704-717. Springer, (2017)
Z. Zhang, L. Xiao, S. Su, L. Ruan, B. Wei, N. Zhou, X. Liu, H. Wang, and Z. Wei. CollaborateCom, volume 252 of Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering, page 591-601. Springer, (2017)