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In a master's thesis the author provided a seemingly incorrect citation. ( Link to paper citation 4)

The information is obviously correct but in the cited paper I couldn't find any reference to the information he cited. Is it ok to cite him?

1 Answer 1

If you want to refer to his work (i.e. his results, discussion or conclusions), you should cite it.

If you want a reference to the particular piece of information he cited (the sentences describing plasma etching before his call to ref. 4), then you should find a direct source: either a textbook or review on the topic. This would be much better than a research article (or thesis), especially one badly sourced.