Any literature on Patran?

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Hey, I was wondering if any of you know some good courses or other literature involving Patran (online or books)? The workbooks on the MSC website are too few and I have a need for more in-depth explanation as to why and how.
I do like the step-by-step approach but I also need to know what each step is precisely doing and even more important, what I need to do if the circumstances change.