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Euan Sinclair gives a fairly thorough treatment of modeling volatility cones, or possible volatility ranges, in his book.

Many people recommend a text by Sinclair

https://www.amazon.com/Option-Trading-Volatility-Strategies-Techniques/dp/0470497106

Found a PDF here:

http://1.droppdf.com › filesPDF Web results Option Trading: Pricing and Volatility Strategies and Techniques ... - DropPDF