Kasparek, Erwin. “Remark on Invariant Straight Lines of Some Affine Transformations in ℝ^n Without Fixed Points”. Annales Mathematicae Silesianae 19 (September 30, 2005): 19–21. Accessed July 17, 2025. https://trrest.vot.pl/ojsus/index.php/AMSIL/article/view/14080.