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 Improved Class of Ratio -Cum- Product Estimators of Finite Population Mean in Two Phase Sampling.
<strong>Global Journal of Science Frontier Research</strong>, [S.l.], june 2014.
ISSN 2249-4626.
Available at: &lt;<a href="https://journalofscience.org/index.php/GJSFR/article/view/1235" target="_new">https://journalofscience.org/index.php/GJSFR/article/view/1235</a>&gt;. Date accessed: 25 may 2022.