A. Piper, N. Weibel, and J. Hollan. Proceedings of the ACM 2012 Conference on Computer Supported Cooperative Work Companion, page 269--270. New York, NY, USA, ACM, (2012)Demo.
S. Manzoor, P. Libbrecht, C. Ullrich, and E. Melis. Mathematical Knowledge Management: 4th International Conference, MKM 2005, Bremen, Germany, July 15-17, 2005, Revised Selected Papers, volume 3863 of LNCS, page 33--48. Heidelberg, Springer, (2006)
K. Falkovych, F. Nack, J. van Ossenbruggen, and L. Rutledge. The Hypermedia and the Semantic Web Workshop at the Fourteenth Conference on Hypertext and Hypermedia (HyperText 2003), (August 2003)This is also published as Technical Report INS-E0307..