Stoel, R. D., & van den Wittenboer, G. (2003). Time Dependence of Growth Parameters in Latent Growth Curve Models with Time Invariant Covariates. In Methods of Psychological Research (Vols. 8, Issue 1, pp. 21-41). Department of Psychology - University of Koblenz-Landau. https://doi.org/10.23668/psycharchives.12780