3 IZA Discussion Papers
IZA Discussion Paper No. 15887
IZA Discussion Paper No. 14113
substantially revised version published as 'COVID-19, College Academic Performance, and the Flexible Grading Policy: A Longitudinal Analysis' in: Journal of Public Economics, 2022, 207, 104606
IZA Discussion Paper No. 9490
published in: Journal of Applied Statistics, 2016, 43 (11), 2044-2052