Iqbal, Muhammad Zaffar, and Sultan Ahmad Khan. 2003. “GENETIC VARIABILITY, PARTIAL REGRESSION, CO-HERITABILITY STUDIES AND THEIR IMPLICATION IN SELECTION OF HIGH YIELDING POTATO GENOTYPES”. Biological Sciences - PJSIR 46 (2):126-28. https://v2.pjsir.org/index.php/biological-sciences/article/view/1607.