Ummadisetti, Chandrakala, Badari Narayana Prasad Rachapudi, and Lakshmi Anu Prabhavathi Devi Bethala. 2014. “Glycerol-Based SO3H-Carbon Catalyst: A Green Recyclable Catalyst for the Chemoselective Synthesis of Pentaerythritol Diacetals”. European Journal of Chemistry 5 (3):536-40. https://doi.org/10.5155/eurjchem.5.3.536-540.1028.