Zero-lag synchronization in coupled time-delayed piecewise linear electronic circuits R. Suresh, K. Srinivasan, D.V. Senthilkumar, I. Raja Mohamed, K. Murali, M. Lakshmanan and J. Kurths Eur. Phys. J. Special Topics, 222 3-4 (2013) 729-744 Published online: 11 July 2013 DOI: 10.1140/epjst/e2013-01876-1