This is the 12956th most frequent Russian word.
литературную
"Literary" (pertaining to literature).
The word 'литературную' describes the noun 'статью' (article), indicating its connection to literature.
Я написал литературную статью.
I wrote a literary article.
Here, 'литературную' modifies the noun 'классику' (classics), specifying the genre.
Она предпочитает читать только литературную классику.
She prefers to read only literary classics.
In this sentence, 'литературную' is an adjective describing 'специализацию' (specialization), showing the subject area focus.