Cheng, Li Xin et Zhong, Huai Jie, On Hereditarily Indecomposable Banach Spaces, Acta mathematica Sinica. English series (Print) , 22(3), 2006, pp. 751-756
This paper shows that every non-separable hereditarily indecomposable Banach space admits an equivalent strictly convex norm, but its bidual can never have such a one; consequently, every nonseparable hereditarily indecomposable Banach space has no equivalent locally uniformly convex norm.