Boldin, R. J., M. Chaudhry, and I. Affaneh. “Islamic And Conventional Equity Indices: An Examination Of Cointegration And Hedging”. International Business & Economics Research Journal (IBER), vol. 13, no. 3, Apr. 2014, pp. 443-52, doi:10.19030/iber.v13i3.8584.