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[1]
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[2]
HEUSNER A, 1954, BER, V87, P1032
[5]
NOZOE T, 1955, CHEM IND-LONDON, P66
[6]
SCHOPF C, 1947, ANN, V558, P109
[10]
ZEILE R, 1954, BER, V87, P439