Noor, Khalida Inayat. “A New Subclass of Quasi Convex Functions”.
Anal. Numér. Théor. Approx.
, vol. 19, no. 2, Aug. 1990, pp. 157-62,
https://ictp.acad.ro/jnaat/journal/article/view/1990-vol19-no2-art10
.