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Lindenstrauss, J., Preiss, D., & Jaroslav, T. (2012-02-26). Smoothness, Convexity, Porosity, and Separable Determination. In Fréchet Differentiability of Lipschitz Functions and Porous Sets in Banach Spaces (AM-179). : Princeton University Press. Retrieved 24 Feb. 2020, from https://www.universitypressscholarship.com/view/10.23943/princeton/9780691153551.001.0001/upso-9780691153551-chapter-003.