1. Bouras, C., Giannaka, E., Tsiatsos, T.: E-collaboration concepts, systems, and applications. In: Encyclopedia of Internet Technologies and Applications, pp. 165–171 (2008)
2. Gao, L.P., Shao, B., Zhu, L., Lu, T., Gu, N.: Maintaining time and space consistencies in hybrid engineering environments: framework and algorithms. Comput. Ind. 59(9), 894–904 (2008)
3. Gao, L.P., Gu, N.: Supporting semantic maintenance of complex undo operations in replicated Co-AutoCAD environments. In: 13th International Proceedings on Computer Supported Cooperative Work in Design 2009, pp. 84–89. IEEE Computer Society (2009)
4. Gao, L.P., Lu, T.: Achieving transparent and real-time collaboration in Co-AutoCAD application. J. Univers. Comput. Sci. 17(14), 1887–1912 (2011)
5. Moncur, R.A.: Data consistency and conflict avoidance in a multi-user CAx environment. Master degree thesis paper 3675, Brigham Young University (2012)