1. Barbu V. Controllability of parabolic and Navier-Stokes equations, Japanese Association of Mathematical Sciences, 200; 56: 143-211.
2. Barbu V. Analysis and Control of Nonlinear Infinite Dimensional Systems, Boston: Academic Press; (1993).
3. M. I. Budyko, The effect of solar radiation variations on the climate of the Earth, Tellus, 1969; 22: 611-619.
4. Díaz J. I. On the controllability of some simple climate models, in Environment, Economics and their Mathematical Models, Díaz J. I, Lions J. L. Eds. Masson, 1994; 29-44.
5. Díaz J. I, Henry J., Ramos A. M. , On the approximate controllability of some semilinear parabolic boundary-value problems, Appl. Math. Opti., 1998; 37: 71-97.