Altinkaya, Şahsene Bi-concave functions defined by Al-Oboudi differential operator. (English) Zbl 1487.30007 Iran. J. Math. Sci. Inform. 17, No. 1, 207-217 (2022). MSC: 30C45 PDFBibTeX XMLCite \textit{Ş. Altinkaya}, Iran. J. Math. Sci. Inform. 17, No. 1, 207--217 (2022; Zbl 1487.30007) Full Text: Link
Altinkaya, Şahsene; Yalçın, Sibel Bi-concave functions involving a differential operator. (English) Zbl 1454.30002 J. Math. Ext. 13, No. 2, 111-122 (2019). MSC: 30C45 30C80 PDFBibTeX XMLCite \textit{Ş. Altinkaya} and \textit{S. Yalçın}, J. Math. Ext. 13, No. 2, 111--122 (2019; Zbl 1454.30002) Full Text: Link