A. Gangadharan, S. Chinthamani, and B. Srutha Keerthi. “Radius of $p$-Valent Strong Starlikeness for Certain Class of Analytic Functions”. International Journal of Mathematics And Its Applications, vol. 3, no. 4 - F, Dec. 2015, pp. 79-83, https://ijmaa.in/index.php/ijmaa/article/view/536.