Ligęza, Jan. “On a Two Point Boundary Value Problem for Linear Differential Equations of the Fourth Order in the Colombeau Algebra”. Annales Mathematicae Silesianae 15 (September 28, 2001): 45–66. Accessed December 5, 2025. https://journals.us.edu.pl/index.php/AMSIL/article/view/14115.