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<strong>Tikrit Journal of Pure Science</strong>, [S.l.], v. 24, n. 5, p. 86-90, sep. 2019.
ISSN 2415-1726.
Available at: &lt;<a href="http://tjps.tu.edu.iq/index.php/j/article/view/872" target="_new">http://tjps.tu.edu.iq/index.php/j/article/view/872</a>&gt;. Date accessed: 14 aug. 2021.
doi: <a href="http://dx.doi.org/10.25130/j.v24i5.872">http://dx.doi.org/10.25130/j.v24i5.872</a>.