Bifurcations and chaos of time delay Lorenz system with dimension 2n+1 Gamal M. Mahmoud, Ayman A. Arafa and Emad E. Mahmoud Eur. Phys. J. Plus, 132 11 (2017) 461 Published online: 07 November 2017 DOI: 10.1140/epjp/i2017-11739-6