1. F. Clarke and I. Ekeland. Nonlinear oscillations and boundary-value problems for Hamiltonian systems. Arch. Rat. Mech. Anal. 78 (1982) 315–333.
2. B.R. Baker. Minspeak, a semantic compaction system that makes self-expression easier for communicatively disabled individuals. Byte, volume 7, number 9, pages 186–202, September 1982.
3. B.R. Baker and R.F. Barry. A Mathematical Model of Minspeak. 2nd Annual European Minspeak Conference, May 31–June 1, 1990.
4. B.R. Baker and E. Nyberg. Semantic compaction: a basic technology for artificial intelligence in AAC. 5th Annual Minspeak Conference, Nov 14–15, 1990.
5. B.R. Baker, P.J. Schwartz, and R.V. Conti. Minspeak, models and semantic relationships. Fifth Annual Minspeak Conference Proceedings, Seattle, WA, November 1990.