Marasi, Hamidreza, and Aliasghar Jodayree Akbarfam. “Dual Equation and Inverse Problem for an Indefinite Sturm–Liouville Problem With M Turning Points of Even Order”. Mathematical Modelling and Analysis 17, no. 5 (November 1, 2012): 618-629. Accessed November 10, 2024. https://btp.vgtu.lt/index.php/MMA/article/view/4898.