Durnová, Helena: Change in progress: Notation and algorithms. (English). In: Fuchs, Eduard (editor): Mathematics throughout the ages. Contributions from the summer school and seminars on the history of mathematics and from the 10th and 11th Novembertagung on the history and philosophy of mathematics, Holbaek, Denmark, October 28-31, 1999, and Brno, the Czech Republic, November 2-5, 2000. (English). Praha: Prometheus, 2001. 80-7196-219-8, pp. 186-195

Yoshino, Kunio: Polya's theorem for non-entire functions. (English). In: Frolík, Zdeněk (ed.): Proceedings of the 11th Winter School on Abstract Analysis. Circolo Matematico di Palermo, Palermo, 1984. pp. [385]-395

Čech, Eduard O funkcích $x^s$, $e^x$, $\log x$, $\sin x$, $\cos x$ (Czech) [On functions $x^s$, $e^x$, $\log x$, $\sin x$, $\cos x$]. Časopis Pěst. Mat. Fys. 57 (1928), 208-217