1. M. Alomari and M. Darus, Some Ostrowski type inequalities for convex functions with applications, RGMIA13 (1) (2010) No. 3, Preprint.
2. M. Alomari and M. Darus, Some Ostrowski type inequalities for quasi-convex functions with applications to special means, RGMIA13 (2) (2010) No. 3, Preprint.
3. N. S. Barnett and S. S. Dragomir, An Ostrowski type inequality for double integrals and applications for cubature formulae, Soochow J. Math., 27(1) (2001), pp. 1-10.
4. C. Buse, P. Cerone, S. S. Dragomir and J. Roumeliotis, A refinement of Grüss type inequality for the Bochner integral of vector-valued functions in Hilbert spaces and applications, J. Korean Math. Soc., 43 (2006), pp. 911-929, https://doi.org/10.4134/jkms.2006.43.5.911
5. P. Cerone and S. S. Dragomir, A refinment of the Grüss inequality and applications, Tamkang J. Math., 38 (2007), pp. 37-49, https://doi.org/10.5556/j.tkjm.38.2007.92