BRAR, Richa, and Sukhwinder Singh BILLING. “Certain Sufficient Conditions for Parabolic Starlike and Uniformly Close-to-Convex Functions”. Studia Universitatis Babeș-Bolyai Mathematica, vol. 61, no. 1, Mar. 2016, pp. 53-62, https://studia.reviste.ubbcluj.ro/index.php/subbmathematica/article/view/5511.