@article{Hua2017IETC,
title     = {Designing hyperchaotic cat maps with any desired number of positive Lyapunov exponents},
author    = {Hua, Zhongyun and Yi, Shuang and Zhou, Yicong and Li, Chengqing and Wu, Yue},
journal   = {IEEE Transactions on Cybernetics},
year      = {2017},
publisher = {IEEE}
}