Wadsworth, F. B., E. Llewellin, C. Rennie, C. Watkinson, J. Mitchell, J. Vasseur, A. Mackie, F. Mackie, A. Carr, T. Schmiedel, T. Witcher, A. Soldati, L. Jackson, A. Foster, K.-U. Hess, D. Dingwell, and R. Hand. “Using Obsidian in Glass Art Practice”. Volcanica, vol. 5, no. 1, May 2022, pp. 183-07, doi:10.30909/vol.05.01.183207.