MathSciNet bibliographic data MR2382964 34A45 (26A24 39A10) Sheng, Qin Hybrid approximations via second-order crossed dynamic derivatives with the $\diamondsuit_\alpha$$\diamondsuit_\alpha$ derivative. Nonlinear Anal. Real World Appl. 9 (2008), no. 2, 628–640. Article

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