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Milnes, A.G., Wenk, E. & Streckeisen, A. On steep isogradic surfaces in the Simplon area: A discussion. Contr. Mineral. and Petrol. 53, 65–70 (1975). https://doi.org/10.1007/BF00402456
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DOI: https://doi.org/10.1007/BF00402456