On the minimal accuracy required for simulating self-gravitating systems by means of direct N-body methods. - Simon Portegies Zwart; Tjarda Boekholt (CoRR, 2014)

Numerical verification of the microscopic time reversibility of Newton's equations of motion: Fighting exponential divergence. - Simon Portegies Zwart; Tjarda Boekholt (Commun. Nonlinear Sci. Numer. Simul., 2018)

Newton vs the machine: solving the chaotic three-body problem using deep neural networks. - Philip G. Breen; Christopher N. Foley; Tjarda Boekholt; Simon Portegies Zwart (CoRR, 2019)