Here are additional cites of research on the users of and environment for distributed mobile personal communication technologies, or what Ron Rice and I shorthand as "Syntopia." Katz, James E. Connections: Social and Cultural Studies of the Telephone in American Life. New Brunswick, NJ: Transaction Publishers, 1999. Katz, James E. "Understanding Communication Privacy: Unlisted Telephone Subscribers in the United States," The Information Society, 12 (4), 1996: 407-423. Katz, James E. "Higher-Order Social Consequences of Widespread Mobile Personal Communications," Pp. 91-120 in C. M. Firestone, The Emerging World of Wireless Communications, (Queenstown, MD: The Aspen Institute and Institute for Information Studies, 1996). Katz, James E. and Philip Aspden "Theories, Data, and Potential Impacts of Mobile Communications," Technological Forecasting and Social Change, 57, 133-156, 1998. Katz, James E. "Communication in the year 2075." Science and the Future. Annual Supplement of the Encyclopedia Britannica. Chicago and London: Encyclopedia Britannica, 1999.