Venkateswarlu, B., D. V. Krishna, N. Rani, and T. RamReddy. “Third Hankel Determinant for the Reciprocals of Bounded Turning Functions”. Eurasian Mathematical Journal, vol. 8, no. 4, Dec. 2017, pp. 92–101, https://emj.enu.kz/index.php/main/article/view/684.