Pakpahan, E.N. and Isa, M.H. and Kutty, S.R.M. and Chantara, S. and Wiriya, W. and Faye, I. (2012) Comparison of polycyclic aromatic hydrocarbons emission from thermal treatment of petroleum sludge cake in the presence of different additives. Journal of Scientific and Industrial Research, 71 (6). pp. 430-436. ISSN 00224456