Critical slowing down indicators in synchronous period-doubling for salamander flicker visionMahtab Mehrabbeik, Ramesh Ramamoorthy, Karthikeyan Rajagopal, Fahimeh Nazarimehr, Sajad Jafari and Iqtadar HussainEur. Phys. J. Spec. Top., 230 16-17 (2021) 3291-3298DOI: https://doi.org/10.1140/epjs/s11734-021-00113-0