1. Nordic Committee on Building Regulations (NKB): “Recommendations for Loading and Safety Regulations for Structural Design,” NKB-Report, No. 36, Copenhagen, 1978.
2. Ditlevsen, O. and Madsen, H.O.: “Proposal for a Code for the Direct Use of Reliability Methods in Structural Design”, JCSS Working Document, 1989.
3. Madsen, H.O., Krenk, S, Lind, N.C: “Methods of Structural Safety”, Prentice-Hall, Inc., Englewood Cliffs, NJ 07632, 1986.
4. Madsen, K and Tingleff, O.: “Robust Subroutines for Non-Linear Optimization” Report NI-90–06, April 1990, Institute for Numerical Analysis, Technical University of Denmark.
5. Schittkowski, K.: “Design, Implementation, and Test of a Nonlinear Programming Algoritlun”, Report, Institut fuer Informatik, Universitaet Stuttgart, 1984.