Hasselmann, Klaus MPI for Meteorology, Max Planck Society;
JoC-1993-Hasselmann.pdf (Publisher version), 2MB
Hasselmann, K. (1993). Optimal fingerprints for the detection of time-dependent climate change. Journal of Climate, 6, 1957-1971. doi:10.1175/1520-0442(1993)006<1957:OFFTDO>2.0.CO;2.