W. Krijnen, and H. Kiers. Advances in longitudinal and multivariate analysis in the behavioral sciences: Proceedings of the SMABS 1992 conference<., ITS, Nijmegen, (1993)
W. Krijnen. Psychometric Methodology. Proceedings of the 7th European Meeting of the Psychometric Society in Trier<., Gustav Fischer Verlag, Stuttgart and New York, (1993)