2. Prasertsan, S. & Prasertsan, P. (1996). Biomass residues from palm oil mills in Thailand: an overview on quantity and potential usage. Biom. Bioen. 11(5), 387–395. DOI: S0961–9534 (96) 00034-7.10.1016/S0961-9534(96)00034-7
6. Ahmad, A., Ismail, S. & Bhatia, S. (2005). Ultrafiltration behavior in the treatment of agro-industry effluent: pilot scale studies. Chem. Engine. Sci. 60(19), 5385–5394. DOI: 10.1016/j.ces.2005.04.021.10.1016/j.ces.2005.04.021
7. Ahmad, A., Sumathi, S. & Hameed, B. (2006). Coagulation of residue oil and suspended solid in palm oil mill effluent by chitosan, alum and PAC. Chem. Engine. J. 118(1), 99–105. DOI: 10.1016/j.cej.2006.02.001.10.1016/j.cej.2006.02.001
11. Del Campo, J.A., García-González, M. & Guerrero, M.G.. (2007). Outdoor cultivation of microalgae for carotenoid production: current state and perspectives. Appl. Microbiol. Biotech. 74(6), 1163–1174. DOI: 10.1007/s00253-007-0844-9.10.1007/s00253-007-0844-9
12. Bhosale, P. & Bernstein, P.S. (2004). β-Carotene production by Flavobacterium multivorum in the presence of inorganic salts and urea. J. Ind. Microbiol. Biotech. 31(12), 565–571. DOI: 10.1007/s10295-004-0187-9.10.1007/s10295-004-0187-9
15. Ahmad, A., Ismail, S. & Bhatia, S. (2005). Membrane treatment for palm oil mill effluent: effect of transmembrane pressure and crossflow velocity. Desalination 179(1), 245–255. DOI: 10.1016/j.desal.2004.11.071.10.1016/j.desal.2004.11.071
16. Liu, G., Liu, Y., Ni, J., Shi, H. & Qian, Y. (2004). Treatability of kraft spent liquor by microfiltration and ultrafiltration. Desalination 160,(1), 131–141. PII: S 0011-9164(03)00588-5.10.1016/S0011-9164(04)90003-3
19. Bustamante, M.A., Moral, R., Paredes, C., Perez-Espinosa, A., Moreno-Caselles, J., Perez Murcia, M.D. (2008). Agrochemical characterisation of the solid by-products and residues from the winery and distillery industry. Waste Manage. 28(2), 372–380. DOI: 10.1016/j.waman.2007.01.013.