“Ideal operators and relative Godun sets: doi:10.17398/2605-5686.34.1.1” (2019) Extracta Mathematicae, 34(1), p. 1–17. Available at: https://revista-em.unex.es/index.php/EM/article/view/2605-5686.34.1.1 (Accessed: 5 April 2025).