Novel study on functionally graded anisotropic doubly curved nanoshells Behrouz Karami, Maziar Janghorban and Abdelouahed Tounsi Eur. Phys. J. Plus, 135 1 (2020) 103 Published online: 23 January 2020 DOI: 10.1140/epjp/s13360-019-00079-y