I’m not entirely certain where to put this question but was hoping for a little direction/help in finding some literature.

I have panel data of newspaper-days. I am testing how newspaper level covariates predict their daily coverage (several different measures). I know I should account for heteroskedasticity within newspapers, one obvious way to do this seems to be to use the distributional modeling approach discussed here. So I have modeled the sigma as a random intercept for each paper.

My problem is that I am having trouble finding literature that actually supports this method. I was hoping someone might have a suggestion of where I can look.