Ben van Calster

Poor performance of clinical prediction models: the harm of commonly applied methods.

Ewout W Steyerberg, John P A Ioannidis, Hajime Uno, 2017, Journal of clinical epidemiology.

Sample size considerations and predictive performance of multinomial logistic prediction models

Maarten van Smeden, Dirk Timmerman, Ewout W Steyerberg, 2019, Statistics in medicine.