«In Memory of René Marek Cieszewski», Math. Comput. For. Nat. Res. Sci., vol. 4, fasc. 1, pp. Pages: 1–1 (1), feb. 2012, Consultato: 4 settembre 2026. [Online]. Disponibile su: https://v3.mcfns.com/index.php/Journal/article/view/MCFNS.4%3A1