The model associated with the paper:

Sadashivaiah V, Sacré P, Guan Y, Anderson WS, Sarma SV (2018) Modeling the interactions between stimulation and physiologically induced APs in a mammalian nerve fiber: dependence on frequency and fiber diameter Journal of Computational Neuroscience

http://dx.doi.org/10.1007/s10827-018-0703-y

is available at the authors github repository

https://github.com/vjysd/nerve-fiber-modeling