1. ACIDIC PROPERTIES OF PLANT LIGNINS AND HUMIC MATERIALS OF SOILS /
S. O. THOMPSON G. CHESTERS // European Journal of Soil Science
Volume 20 Issue 2, Pages 346 - 356 Published Online: 28 Jul 2006
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http://dx.doi.org/10.1111/j.1365-2389.1969.tb01583.x
W. Brown / Journal of Applied Polymer Science
Volume 11 Issue 11, Pages 2381 - 2396 Published Online: 9 Mar 2003
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http://dx.doi.org/10.1002/app.1967.070111125