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I think if he takes info from Krokhmalyuk, it is best to say something like ""Subtelny, cites Krokhmalyuk saying that..."" precisely because Krokhmalyuk is a tricky source as discussed above. Also, if we cite Subtelny citing Krokhmaluk, we should not list Khorkhmaluk in a reference until we see this book ourselves. Until then the ref should say ""Krokhamlyuk, book name, cited through Subtelny"". Irpen  

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