Dehant, V., Loutre, M.-F., & Berger, A. (1990). Potential Impact of the Northern-hemisphere Quaternary Ice Sheets On the Frequencies of the Astroclimatic Orbital Parameters. Journal of Geophysical Research, 95(D6), 7573-7578. https://doi.org/10.1029/JD095iD06p07573 (Original work published 1990)