Chaos in two heteroclinic cycles coupled with chemical synapsesAlexander G. Korotkov, Evgeny A. Grines, Ekaterina V. Syundyukova, Elena V. Gubina and Tatiana A. LevanovaEur. Phys. J. Spec. Top., 234 15 (2025) 4009-4016DOI: https://doi.org/10.1140/epjs/s11734-025-01723-8