Czekalski, Stefan, i Henryk Żołądek. „First Order Linear Differential Equations With Involutive Delay and Hypergeometric Functions”. Topological Methods in Nonlinear Analysis 52, no. 1 (luty 8, 2017): 11–29. Udostępniono lipiec 18, 2024. https://apcz.umk.pl/TMNA/article/view/TMNA.2017.002.