Stellar collisions in flattened and rotating Population III star clusters M. Z. C. Vergara, D. R. G. Schleicher, T. C. N. Boekholt, B. Reinoso, M. Fellhauer, R. S. Klessen and N. W. C. Leigh A&A, 649 (2021) A160 Published online: 01 June 2021 DOI: 10.1051/0004-6361/202140298