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[1]
1906, BER DTSCH CHEM GES, V39, P393
[2]
1906, BER DTSCH CHEM GES, V39, P392
[3]
1893, ANN CHEM, V275, P324
[4]
1905, BER DTSCH CHEM GES, V38, P2766
[5]
1902, CHEM ZENTRALBL, V1, P1278