Lesk, M., “Preserving Digital Objects: Recurrent Needs and Challenges” in Multimedia Preservation: Capturing the Rainbow, ed. D. E. Walker, A. Zampolli, and N. Calzolari, 38, pp. 106-125, National Preservation Office, National Library of Australia, Brisbane, Australia (November 1995). Only available online as http://community.bellcore.com/lesk/ages/ages.html (presented at an MIT conference which has never published its proceedings).