Ghil, Michael, S. Cohn, John Tavantzis, K. Bube, and Eugene Isaacson. 1981. “Applications of estimation theory to numerical weather prediction.” Dynamic meteorology: Data assimilation methods, 139–224. Springer.
Ghil, Michael, and H. Le Treut. 1981. “A climate model with cryodynamics and geodynamics.” Journal of Geophysical Research 86: 5262–5270. Publisher's Version
Ghil, Michael, J. Tavantzis S. Coho, K. Bube, and E. Isaacson. 1981. “Dynamic Meteorology: Data Assimilation Methods.” Applied Mathematical Sciences, edited by L. Bengtsson, Michael Ghil, and E. Källén, Dynamic Meteorology - Data Assimilation Methods, 36: 139–224. Springer-Verlag.