MathSciNet bibliographic data MR2926051 26A33 (34A08 65L12) Sousa, Ercilia How to approximate the fractional derivative of order $1<\alpha\leq2$$1<\alpha\leq2$. Internat. J. Bifur. Chaos Appl. Sci. Engrg. 22 (2012), no. 4, 1250075, 13 pp. Article

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