J.T. Kloprogge, D. Visser, W.N. Martens, L.V. Duong, & R.L. Frost. (2003). Identification by RAMAN Microscopy of magnesian vivianite formed from Fe2+, Mg, Mn2+ and P043-’ in a Roman camp near fort Vechten, Utrecht, The Netherlands. Netherlands Journal of Geosciences, 82, 209-214. https://doi.org/10.1017/S0016774600020758