Ivanchov, N. I., and N. V. Saldina. “Inverse Problem for a Parabolic Equation With Strong Power Degeneration”. Ukrains’kyi Matematychnyi Zhurnal, Vol. 58, no. 11, Nov. 2006, pp. 1487–1500, https://umj.imath.kiev.ua/index.php/umj/article/view/3549.