You can read the abstract and see the sections of the article Induction of lucid dreams: a systematic review of evidence here for free, or click the Purchase link on top of the page and pay $35.95.

I read a review of the article on another dream website. The review says some methods look promising, which is consistent with the abstract, but the review is misleading in giving a "green light" to several techniques without explaining what the article says about those techniques. The abstract of the article says "The methodological quality of the included studies was relatively low. None of the induction techniques were verified to induce lucid dreams reliably and consistently, although some of them look promising."

I'll probably look up that study for free at a library some day.