Relaxation oscillations and canards in the Jirsa–Kelso excitator model: global flow perspectivePiotr Słowiński, Sohaib Al-Ramadhani and Krasimira Tsaneva-AtanasovaEur. Phys. J. Special Topics, 227 5-6 (2018) 591-601DOI: https://doi.org/10.1140/epjst/e2018-00129-2