Textbooks on statistical mechanics usually discuss ergodicity only by words, without presenting any quantitative analysis (equations). On the other hand, serious discussions of ergodicity are usually written in a mathematically highly rigorous form, which is difficult to comprehend by physicists who are not mathematicians. I would like to learn more about ergodicity at a level somewhere between those two. I would like something which contains equations, but is adjusted to physicists, not mathematicians. Can someone recommend an appropriate paper or a book? Thanks!