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[11]
VANSOEST PJ, 1967, J ASSOC OFF ANA CHEM, V50, P50
[12]
VANSOEST PJ, 1963, J ASSOC OFF AGR CHEM, V46, P829
[13]
VANSOEST PJ, 1968, J ASSOC OFF ANA CHEM, V51, P780
[14]
1965, OFFICIAL METHODS ANA