Wadsworth, F. B., Llewellin, E., Rennie, C., Watkinson, C., Mitchell, J., Vasseur, J., Mackie, A., Mackie, F., Carr, A., Schmiedel, T., Witcher, T., Soldati, A., Jackson, L., Foster, A., Hess, K.-U., Dingwell, D., & Hand, R. (2022). Using obsidian in glass art practice. Volcanica, 5(1), 183–207. https://doi.org/10.30909/vol.05.01.183207