Advancing firing model design with cosine nonlinearity: slow variables from discrete memristors and their impact on complex electrical activitiesLiang Yunzhong, Wu Xianming, Wu Jian and He ShaoboEur. Phys. J. Spec. Top., 234 28 (2026) 8715-8731DOI: https://doi.org/10.1140/epjs/s11734-025-01785-8