TALPUR, Mir Munsif Ali et al.
Isolation and Characterization of Soil Fulvic Acid.
<strong>Pakistan Journal of Analytical &amp; Environmental Chemistry</strong>, [S.l.], v. 17, n. 1, p. 10, june 2016.
ISSN 2221-5255.
Available at: &lt;<a href="http://pjaec.pk/index.php/pjaec/article/view/53" target="_new">http://pjaec.pk/index.php/pjaec/article/view/53</a>&gt;. Date accessed: 17 may 2022.