could somebody help me with the Mathematical model of natural pacemaker? please

Hi, I have to make the mathematical model of natural pacemaker, but I've looked for mathematical functions of each segment, I mean sinus node,atrial myocardium and "haz de hiss", but I haven't found anything, could somebody help me? please
I don't want the model made, I just need the mathematical functions of each segment for being able of doing it.
Thanks

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