Xueyi Wang Jiajun Bu Chun Chen Research on Conflict Resolution and Operation Consistency in Real-Time Collaborative Graphic Designing System. 145-150 2002 CSCWD http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=1047670&isnumber=22453 conf/cscwd/2002 db/conf/cscwd/cscwd2002.html#WangBC02