Double Higgs production in the littlest Higgs model with T-parity at high energy colliders Bingfang Yang, Zhiyong Liu, Ning Liu and Jinzhong Han Eur. Phys. J. C, 74 12 (2014) 3203 Published online: 11 December 2014 DOI: 10.1140/epjc/s10052-014-3203-x