“Essential g-Ascent and g-Descent of a Closed Linear Relation in Hilbert Spaces” (2017) Extracta Mathematicae, 32(2), p. 125–161. Available at: https://revista-em.unex.es/index.php/EM/article/view/2605-5686.32.2.125 (Accessed: 21 December 2024).