Gladkivs’kaO. V. (1997) “An example of a complete orthonormal system in a Hilbert space of generalized functions”, Ukrains’kyi Matematychnyi Zhurnal, 49(5), pp. 725–728. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/5055 (Accessed: 24November2024).