George G. Robertson Mary Czerwinski Kevin Larson Daniel C. Robbins David Thiel Maarten van Dantzich Data Mountain: Using Spatial Memory for Document Management. 153-162 1998 ACM Symposium on User Interface Software and Technology http://doi.acm.org/10.1145/288392.288596 db/conf/uist/uist1998.html#RobertsonCLRTD98