Abbasоv A. (2011) “Fredholm quasi-linear manifolds and degree of Fredholm quasi-linear mapping between them”, Ukrains’kyi Matematychnyi Zhurnal, 63(5), pp. 579–595. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/2744 (Accessed: 16 April 2025).