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Document type:
Zeitschriftenaufsatz 
Author(s):
Schmidt M, Knicker H, Hatcher P, Kögel-Knabner I 
Title:
Does ultrasonic dispersion and homogenization by ball milling change the chemical structure of organic matter in geochemical samples? - a CMPAS 13C NMR study with lignin 
Journal title:
Organic Geochemistry 
Year:
1997 
Journal issue:
26 
Pages contribution:
491-496