Rässler, Susanne. “Data Fusion: Identification Problems, Validity, and Multiple Imputation”. Austrian Journal of Statistics 33, no. 1&2 (April 3, 2016): 153–171. Accessed May 5, 2024. https://www.ajs.or.at/index.php/ajs/article/view/vol33%2C%20no1%262%20-%209.