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KIRCHHOF F, 1913, KOLL Z, V13, P51
[2]
POGGENDORFS, 1872, ANN, V146, P626
[3]
WEBER CO, 1906, CHEM INDIA RUBBER, P39
[4]
1913, EBENDA, V13, P54
[5]
1910, CAOUTCHOUC GUTTAPERC, P79
[6]
1919, UNTERSUCHUNGEN NATUR, P6
[7]
1913, VGL KOLL Z, V13, P60
[8]
1909, KOLL Z, V4, P232