Abu-Bakar, Siti Hawa, Muhammad-Sukki, Firdaus, Ramirez-Iniguez, Roberto, Mallick, Tapas Kumar, McLennan, Campbell, Munir, Abu Bakar, Yasin, Siti Hajar Mohd, Rahimh, Ruzairi Abdul, "Is renewable heat incentive the future?", Renewable and Sustainable Energy Reviews, 2013