Freise, Diana, Hendrik Schmitz, and Matthias Westphal. “Late-Career Unemployment and Cognitive Abilities.”https://doi.org/10.1016/j.jhealeco.2022.102689__Journal of Health Economics 86 (2022).https://doi.org/10.1016/j.jhealeco.2022.102689 .

Westphal, Matthias, Daniel A. Kamhöfer, and Hendrik Schmitz. “Marginal College Wage Premium under Selection into Employment.”https://doi.org/10.1093/ej/ueac021__Economic Journal 132, no. 646 (2022): 2231–72.https://doi.org/10.1093/ej/ueac021 .

Schmitz, Hendrik, and Matthias Westphal. The Dynamic and Heterogeneous Effects of Retirement on Cognitive Decline. Vol. 918.  Ruhr Economic Papers. RWI - Leibniz-Institut für Wirtschaftsforschung, Ruhr-University Bochum, TU Dortmund University, University of Duisburg-Essen, 2021.

Kamhöfer, Daniel A, Hendrik Schmitz, and Matthias Westphal. “Heterogeneity in Marginal Non-Monetary Returns to Higher Education.”https://doi.org/10.1093/jeea/jvx058__Journal of the European Economic Association 17, no. 1 (2019): 205–44.https://doi.org/10.1093/jeea/jvx058 .

Schmitz, Hendrik, and Matthias Westphal. “Informal Care and Long-Term Labor Market Outcomes.”https://doi.org/10.1016/j.jhealeco.2017.09.002__Journal of Health Economics 56 (2017): 1–18.https://doi.org/10.1016/j.jhealeco.2017.09.002 .

Schmitz, Hendrik, and Matthias Westphal. “Short-and Medium-Term Effects of Informal Care Provision on Female Caregivers’ Health.”https://doi.org/10.1016/j.jhealeco.2015.03.002__Journal of Health Economics 42 (2015): 174–85.https://doi.org/10.1016/j.jhealeco.2015.03.002 .