Modeling Trading Volume

In financial mathematics literature, price movement of an equity is modeled as an exponential Brownian motion.

But I haven't found any substantial paper on modeling trading Volume. Anyone have insights on how trading volume is typically modeled?

I have a strong suspicion that trading volume is log normally distributed but what do I know. I'm wondering of there's an underlying stochastic process that people model it with? Should I take this to AM and HF threads?

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