I think that "a yet another" is superfluous, because the "a" is implicit in "another" ("another" = "an other"). , newspapers, &c. On the other hand, the Oxford Dictionary lists various uses of "yet," and whereas it lists "a yet more generous policy," when it illustrates the use of "yet another," there is no "a" in front in any of the examples.
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I think that "a yet another" is superfluous, because the "a" is implicit in "another" ("another" = "an other"). But I have seen "a yet another" used in, e.g., newspapers, &c. On the other hand, the Oxford Dictionary lists various uses of "yet," and whereas it lists "a yet more generous policy," when it illustrates the use of "yet another," there is no "a" in front in any of the examples.