1. van der Pol B. A theory of the amplitude of free and forced triode vibrations. Radio Rev 1:754–62, 19207.
2. A quantitative description of membrane current and application to conduction and excitation in nerve;Hodgkin;J Phys,1952
3. Multi-timescale systems and fast-slow analysis;Bertram;Math Biosci,2017
4. Geometrical singular perturbation theory for ordinary differential equations;Fenichel;J Differential Equations,1979
5. Bursting oscillation in an excitable membrane model;Rinzel,1985