Oh for Heaven's Sake!
Where the hell are you planning to use this information? If you're going to experiment with this rubbish in a mountainous area then I don't expect to hear any more about this. Instead of learning the bl**dy THEORY, why the h*ll don't you take your chosen aeroplane type up to about 8,000 feet over a sea level environment and CAUTIOUSLY (note the emphasis) test things for yourself!
The reality is that, if you get into that situation in a mountainous area, you are MOST UNLIKELY (note the emphasis) to survive. If you are a professional pilot who's considering work for a company that operates in that sort of environment, let them TRAIN you for it. If you are not a professional pilot, either you're an accident statistic that's about to yet again smudge the name of GA all over the countryside, or you will leave such an environment to the professionals.