1. Steady free convection in a porous medium heated from below;Elder;J. Fluid Mech,1967
2. Convection naturelle et convection mixte en milieu poreux;Combarnous,1970
3. Thermal convection in a fluid filled porous layer with uniform internal heat sources;Buretta,1972
4. Die Warmeleitfahigheit korniger Stoffe und ihre Beeinflussung durch freie Konvektion;Schneider,1963
5. Criterion for onset of convective flow in a fluid in a porous medium;Katto;Int. J. Heat Mass Transfer,1976