Subramani, J, G Kumarapandiyan, and S Balamurali. 2014. “Some Modified Linear Regression Type Ratio Estimators for Estimation of Population Mean Using Known Parameters of an Auxiliary Variable”. Journal of Building Construction, Planning and Materials Research 1 (1):28-42. https://archive.conscientiabeam.com/index.php/84/article/view/2397.