I recommend that you not submit any papers with this publisher. The DOI is not a measure of quality. Usually when publishers like this do not charge processing fees it means they are desperate for articles because they want to make it appear they receive many submissions. I see that one of their journals is called the <em>International Journal of Scientific World</em>. This is a strange title and it is clear that the journal will accept papers from all fields. My advice: find a better publisher than this one.
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