H. A. Knoef and . Ed, Handbook Biomass Gasification, Biomass Technology Group, 2005.

B. Gobel and U. Henriksen, Dynamic modelling of char gasification in a fixed-bed, Progress in Thermochemical Biomass Conversion, pp.92-108, 2001.

M. Barrio, Experimental investigation of smallscale gasification of woody biomass": Doctorate thesis, 2002.

. Dr and . Ingeniøravhandling,

. Trondheim,

T. Krishnudu, S. N. B.-madhusudhan, V. S. Reddy, K. S. Sastry, R. Rao et al., Studies in a moving bed pressure gasifier: prediction of reaction zones and temperature profile, Ind. Eng. Chem. Res, vol.28, issue.4, pp.438-444, 1989.

M. Barrio, M. Fossum, and J. E. Hustad, A smallscale stratified downdraft gasifier coupled to a gas engine for combined heat and power productioné, pp.426-440, 2001.

M. -barrio, M. Fossum, and J. E. Hustad, Operational characteristics of Small-scale Stratified Downdraft Gasifier". in Technologies and combustion for clean environment, Sixth International Conference, pp.9-12, 2001.

-. Blasi, C. , G. Signorelli, and G. Portoricco, Countercurrent fixed-bed gasification of biomass at laboratory scale, Industrial Engineering Chemistry Research, vol.38, pp.2571-2581, 1999.

W. -yang, A. Ponzio, C. Lucas, and W. Blasiak, Performance analysis of a fixed-bed biomass gasifier using high-temperature air, Fuel Processing Technology, vol.87, issue.3, pp.235-245, 2006.

P. -lv, Z. Yuan, L. Ma, C. Wu, Y. Chen et al., Hydrogen-rich gas production from biomass air and oxygen/steam gasification in a downdraft gasifier, Renewable Energy, vol.32, issue.13, pp.2173-2185, 2007.

A. Bhattacharya, L. Salam, M. P. Dudukovic, and B. Joseph, Experimental and modeling studies in fixed-bed char gasification, Ind. Eng. Chem. Proc. Des. Dev, vol.25, issue.4, pp.988-996, 1986.

B. Gobel, U. Henriksen, T. K. Jensen, B. Qvale, and N. Houbak, Bioresource Technology, vol.98, issue.10, pp.2043-2052, 2007.

W. F. Fassinou, L. Van-de-steene, S. Toure, G. Volle, and P. Girard, Pyrolysis of Pinus pinaster in a two-stage gasifier: Influence of processing parameters and thermal cracking of tar, Fuel Processing Technology, vol.90, issue.1, pp.75-90, 2009.

M. L. Hobbs, P. T. Radulovic, and L. D. Smoot, Combustion and gasification of coals in fixed-beds, Energy Combustion Science, 1993.