1. Torrance, K. E. & Turcotte, D. L. 1971 Thermal convection with large viscosity variations.J. Fluid Mech. 47,113.
2. Krishnamurti, R. 1968 Finite amplitude convection with changing mean temperature. Part 1. Theory.J. Fluid Mech. 33,440.
3. Hoard, C. Q. , Robertson, C. R. & Acrivos, A. 1970 Experiments on the cellular structure in Bénard convection.Int. J. Heat Mass Transfer 13,849.
4. Jenssen, O. 1963 Note on the influence of variable viscosity on the critical Rayleigh number.Acta Polytech. Scand. 24,1.
5. Busse, F. H. 1967 The stability of finite amplitude cellular convection and its relation to an extremum principle.J. Fluid Mech. 30,625.