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- [3] KRUSCH B, 1921, LAGERSTATTEN NUTZBAR, V2, P846
- [4] 1877, Z ANAL CH, V16, P449
- [5] 1878, Z KRYST, V9, P571
- [6] 1901, T AM I MIN ENG, V31, P806
- [7] 1920, UNTERSUCHUNG BEWERTU, V3, P218
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- [9] 1877, Z ANAL CH, V16, P439
- [10] 1912, EXISTENZ MOLEKULE LE, P167