Generalized synchronization in relay systems with instantaneous couplingRemoveR. Gutiérrez, R. Sevilla-Escoboza, P. Piedrahita, C. Finke, U. Feudel, J. M. Buldú, G. Huerta-Cuellar, R. Jaimes-Reátegui, Y. Moreno, and S. BoccalettiPhys. Rev. E 88, 052908 (2013)