Gmelin Handbook: Ni: MVol.B3, 53, page 884 - 886
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Soupert, J.-P.
These Univ. Caen 1926, S. 20
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Soupert, J.-P.
These Univ. Caen 1926, S. 35
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Soupert, J.-P.
These Univ. Caen 1926, S. 41
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Soupert, J.-P.
These Univ. Caen 1926, S. 48