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• G. Gr¨uss,Uber das maximum des absoluten Betrages von ¨ 1 b−aaf (x) g (x) dx − bf (x) g (x) dx − 1 (b−a)2a ag (x) dx, Math. Z. 39 (1935) 215–226.
• Z. Liu, Refinement of an inequality of Gr¨uss type for Riemann-Stieltjes integral. Soochow J. Math. 30 (2004), no. 4, 483–489. 1Department of Mathematics, Faculty of Science and Technology, Jadara Univer- sity, 21110 Irbid, Jordan.
• E-mail address: mwomath@gmail.com 2Mathematics, School of Engineering & Science, Victoria University, PO Box 14428,
• Melbourne City, MC 8001, Australia. 3School of Computational & Applied Mathematics, University of the Witwater- srand, Johannesburg, South Africa.
• E-mail address: sever.dragomir@vu.edu.au