- K. Rycerz, P. Frąckiewicz: A quantum approach to twice-repeated 2 × 2 game. Quantum Information Processing; ISSN 1570-0755. — 2020 vol. 19 iss. 8 art. no. 269, s. 1–20. — Bibliogr. s. 19–20, Abstr., https://link.springer.com/content/pdf/10.1007/s11128-020-02743-0.pdf (2020)