1. ASHRAE, ASHRAE Handbook – Fundamentals, ASHRAE, 1997
2. A.G. McGowan, A.O. Desjarlais, J.L. Wright, Simulation and testing of pyramid and barrel vault skylights, ASHRAE Transactions: Symposia, 1998, pp. 832–844
3. Heat transfer by natural convection between concentric spheres;Bishop;Int. J. Heat Mass Transfer,1965
4. Natural convection heat transfer between concentric spheres;Scanlan;Int. J. Heat Mass Transfer,1970
5. Natural convection flow patterns in spherical annuli;Yin;Int. J. Heat Mass Transfer,1973