I think that determiner is just a newer or alternative classification for the cases traditionally designated as adjective. "other" in "other boy" is a determiner or adjective. I see no way that "others" can be an adjective.
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Anonymousour grammar books reads "there are only plural nouns after adjective form of" other"That "rule" is not complete. That statement is true only when there is no "the" before "other".