INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, vol. 33, no. 19, page. 5176 - 5183, 2008-10
BIORESOURCE TECHNOLOGY, vol. 99, no. 14, page. 6666 - 6672, 2008-09
BIORESOURCE TECHNOLOGY, vol. 99, no. 6, page. 2061 - 2066, 2008-04