As a Torah reader, I was fascinated when I visited Heichal Hasefer - "Shrine of the Book" and read about the Qumran society and their calendar. As far as I know, there doesn't seem to be much, if anything, mentioned about them or their calendar in the Talmud. At least I'm not finding it via web searches.
Is there anything mentioned in the Talmud or other "halachic" sources (Midrash, etc.) about their calendar? If so, please provide references.