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| Ostenfeld, C.H. and Nygaard, | |
| 1925 | |
| - |
Ostenfeld, C.H. and Nygaard, 1925: (Cited, but reference not given, in Schiller, 1935a, p.155)
| Ostenfeld, C.H. and Nygaard, | |
| 1925 | |
| - |