A paper has been published on a blog by a researcher in Dead Sea Scrolls, regarding certain Jewish mystical literature.

"This paper explores the relationship between the Hekhalot literature -- the pre-Kabbalistic corpus of mystical texts that give instructions on how to ascend (or "descend") to the celestial "palaces" or the "Merkavah," God's heavenly throne-chariot, and the Jewish apocalypses that survive from the early centuries C.E. and earlier."

For full details, see PaleoJudaica.