I just received an invitation to publish a paper on the journal "Quarterly Physics Review" (www.journals.ke-i.org/index.php/qpr), and I would like to know if this is a serious journal. I am asking this, because a couple of years ago I had a bad experience with another journal, which later I found it among the list of "predator journals". If anyone could give me a hint on this, I would be grateful.

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