PiętkaM. (1990) “A note on the increase of the operational function exp(λΣ_{k=1}^{n}A_{k}s^{p_k})”, Annales Mathematicae Silesianae, 3, pp. 107-114. Available at: https://journals.us.edu.pl/index.php/AMSIL/article/view/14309 (Accessed: 21November2024).