Singh, Ram, and Sukhjit Singh. “Convolution Properties of a Class of Starlike Functions”. Proceedings of the American Mathematical Society, vol. 106, no. 1, 1989, p. 145, https://doi.org/10.2307/2047386.
Singh, R., & Singh, S. (1989). Convolution Properties of a Class of Starlike Functions. Proceedings of the American Mathematical Society, 106(1), 145. https://doi.org/10.2307/2047386
Singh R, Singh S. Convolution Properties of a Class of Starlike Functions. Proceedings of the American Mathematical Society. 1989;106(1):145.