Opart Septhum. 1996. The effect of cetane improver on polycyclic aromatic hydrocarbons in diesel exhaust. Bangkok:Chulalongkorn University;
Opart Septhum. (1996) The effect of cetane improver on polycyclic aromatic hydrocarbons in diesel exhaust (รายงานผลงานวิจัย). Chulalongkorn University:Bangkok.
Opart Septhum. The effect of cetane improver on polycyclic aromatic hydrocarbons in diesel exhaust. Bangkok:Chulalongkorn University, 1996.
Opart Septhum. (1996) The effect of cetane improver on polycyclic aromatic hydrocarbons in diesel exhaust (รายงานผลงานวิจัย). Chulalongkorn University:Bangkok.