Spaced repetition seems pretty powerful. It seems like doing this while reading a book might be more repetitive than spaced repetition techniques recommend, but on the other hand you also have ongoing repetition of some of the more common words as you read the chapter. Thanks for the interesting article!

I think Spaced Repetition is precisely a tool, in the context of languages, for the words you don't get enough or constant enough contact through reading, writing, listening and speaking. For words that you do, you don't really need it since you'll memorize it from actual use/need.