Note: OCR errors may be found in this Reference List extracted from the full text article. ACM has opted to expose the complete List rather than only correct and linked references.

	1	Eric A. Bier , Maureen C. Stone , Ken Pier , William Buxton , Tony D. DeRose, Toolglass and magic lenses: the see-through interface, Proceedings of the 20th annual conference on Computer graphics and interactive techniques, p.73-80, September 1993  [doi>10.1145/166117.166126]
	2	Steven J. DeRose , David G. Durand, Making Hypermedia Work: A User's Guide to HyTime, Kluwer Academic Publishers, Norwell, MA, 1994
	3	Andrew M. Fountain , Wendy Hall , Ian Heath , Hugh C. Davis, MICROCOSM: an open model for hypermedia with dynamic linking, Hypertext: concepts, systems and applications, Cambridge University Press, New York, NY, 1992
	4	Frank,G. Halasz, Reflections on NoteCards: seven issues for the next generation of hypermedia systems, Communications of the ACM, v.31 n.7, p.836-852, July 1988  [doi>10.1145/48511.48514]
	5	Daryl T. Lawton , Ian E. Smith, The Knowledge Weasel hypermedia annotation system, Proceedings of the fifth ACM conference on Hypertext, p.106-117, November 14-18, 1993, Seattle, Washington, United States  [doi>10.1145/168750.168793]
	6	Catherine C. Marshall, Annotation: from paper books to the digital library, Proceedings of the second ACM international conference on Digital libraries, p.131-140, July 23-26, 1997, Philadelphia, Pennsylvania, United States  [doi>10.1145/263690.263806]
	7	Thomas A. Phelps, Multivalent Documents: Anytime, Anywhere, Any Type, Every Way, University of California at Berkeley, Berkeley, CA, 1998
	8	Thomas A. Phelps , Robert Wilensky, Robust intra-document locations, Proceedings of the 9th international World Wide Web conference on Computer networks : the international journal of computer and telecommunications netowrking, p.105-118, June 2000, Amsterdam, The Netherlands
	9	Martin Röscheisen , Christian Mogensen , Terry Winograd, Beyond browsing: shared comments, SOAPs, trails, and on-line communities, Proceedings of the Third International World-Wide Web conference on Technology, tools and applications, p.739-749, April 1995, Darmstadt, Germany

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