P. AGARWAL, SURAJ, RAJESH KHANNA, RITESH KARMARKAR, MD. KHALID ANWER, and ROOP K. KHAR. 2010. “Physico-Chemical, Spectral and Thermal Characterization of Shilajit, A Humic Substance With Medicinal Properties&Dagger”;. Asian Journal of Chemistry 20 (1):209-17. https://asianpubs.org/index.php/ajchem/article/view/19390.