ValitskiiY. N., GoletsB. I. and ZelenyakT. I. (2003) “Multipoint Boundary Conditions for Differential Operators”, Ukrains’kyi Matematychnyi Zhurnal, 55(1), pp. 126-131. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/3894 (Accessed: 27July2024).