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[2] W. H. Young, G. С. Young: On derivatives and the theorem of the mean. Quarterly Journal of Pure and Applied Mathematics, Vol. 40, 1909, 1 - 26.

[3] J. B. Diaz, R. Výborný: On mean value theorems for strongly continuous vector valued functions. To appear in Contributions to Differential Equations. 323 MR 0159904