by Whitlock, Cathy, Sarna-Wojcicki, Andrei M., Bartlein, Patrick J., Nickmann, Rudy J.
Published in Palaeogeography, palaeoclimatology, palaeoecology (2000)

by Leopold, E.B, Nickmann, R, Hedges, J.L, Ertel, J.R
Published in Science (American Association for the Advancement of Science) (24.12.1982)

by BROOK, G. A, KEFERL, E. P, NICKMANN, R. J
Published in International journal of speleology (1987)

by Nickmann, R.J, Demarest, J.M. II
Published in Quaternary research (1982)