PrykarpatskyA. K., & SamoilenkoV. G. (2004). Structure of Binary Darboux-Type Transformations for Hermitian Adjoint Differential Operators. Ukrains’kyi Matematychnyi Zhurnal, 56(2), 271-275. Retrieved from https://umj.imath.kiev.ua/index.php/umj/article/view/3751