1. Andersen, E. B.The numerical solution of a set of conditional estimation equations (Rep. No. 5). Copenhagen: Copenhagen School of Economics and Business Administration, 1970.
2. Res. Rep.;E. B. Andersen,1975
3. Gustafsson, J. E. & Lindblad, T.The Rasch model for dichotomous items: A solution of the conditional estimation problem for long tests and some thoughts about item screening procedures. Paper presented at the European Conference on Psychometrics and Mathematical Psychology, Uppsala, Sweden, June 15–17, 1978.
4. Rasch, G. An informal report on a theory of objectivity in comparisons. In L. J. Th. Van der Kamp & C. A. J. Vlek (Eds.),Measurement theory. Proceedings of the NUFFIC international summer session in science at “Het Oude Hof”, The Hague, July 14–28, 1966. Leiden: University of Leiden, 1967.
5. Rasch, G.A mathematical theory of objectivity and its consequences for model construction. Paper presented at the European Meeting on Statistics, Econometrics, and Management Science, Amsterdam, The Netherlands, September 2–7, 1968.