Asteroid “one-sided” families: Identifying footprints of YORP effect and estimating the age Paolo Paolicchi, Zoran Knežević, Federica Spoto, Andrea Milani and Alberto Cellino Eur. Phys. J. Plus, 132 7 (2017) 307 Published online: 14 July 2017 DOI: 10.1140/epjp/i2017-11628-0