Chaos in a calcium oscillation model via Atangana-Baleanu operator with strong memory J. F. Gómez-Aguilar, Kashif Ali Abro, Olusola Kolebaje and Ahmet Yildirim Eur. Phys. J. Plus, 134 4 (2019) 140 Published online: 08 April 2019 DOI: 10.1140/epjp/i2019-12550-1