The role of intermediaries in the synchronization of pulse-coupled oscillators R.A. García, N. Rubido, A.C. Martí and C. Cabeza Eur. Phys. J. Special Topics, 223 13 (2014) 2819-2829 Published online: 10 December 2014 DOI: 10.1140/epjst/e2014-02295-6