Sequential activity and multistability in an ensemble of coupled Van der Pol oscillatorsTatiana A. Levanova, Maxim A. Komarov and Grigory V. OsipovEur. Phys. J. Special Topics, 222 10 (2013) 2417-2428DOI: https://doi.org/10.1140/epjst/e2013-02026-7