Hasselmann, Klaus MPI for Meteorology, Max Planck Society;
https://gdz.sub.uni-goettingen.de/id/PPN1015067948_0043 (Any fulltext)
LOG_0055.pdf (Publisher version), 843KB
Hasselmann, K. (1977). Application of 2-timing methods in statistical geophysics. Journal of Geophysics - Zeitschrift für Geophysik, 43, 351-358.