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[1]
GUILBERT H. R., 1934, Industrial and Engineering Chemistry. Analytical edition, V6, P452, DOI 10.1021/ac50092a029
[2]
MUNSEY V. E., 1937, Journal of the Association of Official Agricultural Chemists, V20, P459
[3]
PETERSON W. J., 1937, Industrial and Engineering Chemistry. Analytical edition, V9, P71, DOI 10.1021/ac50106a007