Srutha Keerthi, B., and Bhuvaneswari Raja. “Coefficient Inequality for Certain New Subclasses of Sakaguchi Type Function Related to Sigmoid Functions”. International Journal of Engineering and Technology, vol. 7, no. 4.36, Dec. 2018, pp. 759-61, https://doi.org/10.14419/ijet.v7i4.36.24236.