1. Progress in the production of hot-gas filtered biocrude oil at NREL
2. Lefebvre , A. H. ( 1989 )Atomization and Sprays, Hemisphere Publishing Corp. , New York , Chap. 4 , pp. 105 – 150 .
3. Owen , K. and Coley , T. ( 1990 )Automotive Fuels Handbook, Society of Automotive Engineers , Chap. 14 , pp. 334 .