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