Seddig, Daniel, and Heinz Leitgöb. “Approximate Measurement Invariance and Longitudinal Confirmatory Factor Analysis: Concept and Application With Panel Data”. Survey Research Methods 12, no. 1 (April 12, 2018): 29–41. Accessed April 20, 2024. https://ojs.ub.uni-konstanz.de/srm/article/view/7210.