Optimization Studies on Improving the Dielectric Properties of Alkali Treated Fibers from Phaseolus Vulgaris Reinforced Polyester Composites by Central Composite Design oleh B. Gurukarthik Babu, D. Princewinston, V.C. Padmanaban, G.Abdul Lathief Sherief, M. Kiruba Sankar, P.V. Aravind Bhaskar