Antimonotonicity and multistability in a fractional order memristive chaotic oscillatorChao-Yang Chen, Karthikeyan Rajagopal, Ibrahim Ismael Hamarash, Fahimeh Nazarimehr, Fawaz E. Alsaadi and Tasawar HayatEur. Phys. J. Special Topics, 228 10 (2019) 1969-1981DOI: https://doi.org/10.1140/epjst/e2019-800222-7