Holmberg, Johanna, et al. “Metamorphic Conditions of the Omphacite-Garnet Gneiss from Otrøy, Western Gneiss Region, Scandinavian Caledonides”. Geology, Geophysics and Environment, vol. 42, no. 1, July 2016, p. 75, https://doi.org/10.7494/geol.2016.42.1.75.