Viscosimetric studies on molecular weight fractions of fulvic and humic acids of aquatic, terrestrial and microbial origin

1985 ◽  
Vol 87 (2) ◽  
pp. 209-221 ◽  
Author(s):  
S. A. Visser
Fuel ◽  
1981 ◽  
Vol 60 (8) ◽  
pp. 685-688 ◽  
Author(s):  
Elena M. Balabanova-Radonova ◽  
Maia D. Stefanova

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