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Dekker, P., Sheen, R.T., Kahler, H.L. et al. Kautschuk, Gummi. Fresenius, Zeitschrift f. anal. Chemie 116, 461–464 (1939). https://doi.org/10.1007/BF01452926
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DOI: https://doi.org/10.1007/BF01452926