1. D.J. Andrews, H. Bruun, B.S. Hansen, P.G. Larsen, N. Plat, et al. Information Technology — Programming Languages, their environments and system software interfaces — Vienna Development Method-Specification Language Part 1: Base language. ISO, 1995.
2. René Elmstrøm, Peter Gorm Larsen, and Poul Bøgh Lassen. The IFAD VDM-SL Toolbox: A Practical Approach to Formal Specifications. ACM Sigplan Notices, 29(9):77–80, September 1994.
3. J. S. Fitzgerald, T. M. Brookes, M. A. Green, and P. G. Larsen. Formal and informal specifications of a secure system component: first results in a comparative study. In M. Naftalin, B. T. Denvir, and M. Bertran, editors, FME'94: Industrial Benefit of Formal Methods, volume 873 of Lecture Notes in Computer Science, pages 35–44. Springer-Verlag, 1994.
4. J. S. Fitzgerald. The ConForm Project Home Page. World-wide web at URL: http://www.cs.ncl.ac.uk/research/csr/projects/ConForm.html, 1995.
5. J.S. Fitzgerald, P.G. Larsen, T.M. Brookes, and M.A. Green. Applications of Formal Methods, chapter 14 Developing a Security-critical System using Formal and Convential Methods. Prentice-Hall International Series in Computer Science, 1995.