Sources of sedimentary PAHs in tropical Asian waters : differentiation between pyrogenic and petrogenic sources by alkyl homolog abundance. by Saha, Mahua, Togo, Ayako, Mizukawa, Kaoruko, Murakami, Michio, Takada, Hideshige, Zakaria, Mohamad Pauzi, H. Chiem, Nguyen, Tuyen, Bui Cach, Prudente, Maricar, Boonyatumanond, Ruchaya, Sarkar, Santosh Kumar, Bhattacharya, Badal, Mishra, Pravakar, Tana, Touch Seang