^Wacław Sierpiński, as quoted in Rotkiewicz, A. (1972), "W. Sierpiński's works on the theory of numbers", Rendiconti del Circolo Matematico di Palermo, Serie II, 21: 5–24, doi:10.1007/BF02844227, MR0323676: "In July 1941 one of my oldest students Stanislaw Ruziewicz was murdered. He was a retired full professor of Jan Kazimierz University in Lvov, the last rector of Foreign Trade Academy in Lvov, an outstanding mathematician and an excellent teacher."
^Lubotzky, Alexander (2010), "2 The Banach–Ruziewicz Problem", Discrete Groups, Expanding Graphs and Invariant Measures, Modern Birkhäuser Classics, Basel: Birkhäuser Verlag, pp. 7–18.