1. Dragomir, S.S.: A generalisation of Grüss’ inequality in inner product spaces and applications. J. Math. Anal. Appl. 237, 74–82 (1999)
2. Dragomir, S.S.: Some Grüss type inequalities in inner product spaces. J. Inequal. Pure Appl. Math. 4(2), Article 42 (2003)
3. Dragomir, S.S.: A counterpart of Schwarz’s inequality in inner product spaces. East Asian Math. J. 20(1), 1–10 (2004)
4. Dragomir, S.S.: Reverses of Schwarz, triangle and Bessel inequalities in inner product spaces. J. Inequal. Pure Appl. Math. 5(3), Article 76 (2004)
5. Dragomir, S.S.: New reverses of Schwarz, triangle and Bessel inequalities in inner product spaces. Australian J. Math. Anal. Appl. 1, Issue 1, Article 1, 1–18 (2004)