Hasselmann, Klaus MPI for Meteorology, Max Planck Society;
1-s2.0-0377026579900290-main.pdf (Publisher version), 2MB
Hasselmann, K. (1979). Linear statistical models. Dynamics of Atmospheres and Oceans, 3, 501-521. doi:10.1016/0377-0265(79)90029-0.