Question: Who proclaimed that the author of the play "The Twelve Months" was the founder of Russia's children's literature?
Sentence (from "The Twelve Months (1956 film)"): The Twelve Months (Russian: Двенадцать месяцев ; "Dvenadtsat mesyatsev") is a 1956 Soviet traditionally animated feature film directed by the "patriarch of Russian animation", Ivan Ivanov-Vano.
Relevant evidence: Yes