The Active Badge Location System. - Roy Want; Andy Hopper; Veronica Falcao; Jonathan Gibbons (ACM Trans. Inf. Syst., 1992)

An Overview of the Spring System. - James G. Mitchell; Jonathan Gibbons; Graham Hamilton; Peter B. Kessler; Yousef Y. A. Khalidi; Panos Kougiouris; Peter Madany; Michael N. Nelson; Michael L. Powell; Sanjay R. Radia (COMPCON, 1994)