1. Cornoni-Huntley, J., Brock, D. B., Ostfeld, A. M., Taylor, J. O. and Wallace, R. B. (eds), Established Populations for Epidemiologic Studies of the Elderly Data Book, US Government Printing Office, Washington D.C., 1986.
2. Critchlow, D., Metric methods for analyzing partially ranked data, Springer Lecture Notes in Statistics 34, 1985.
3. Dempster, A. P., Laird, N.M. and Rubin, D. B., Maximum likelihood from incomplete data via the EM algorithm (with discussion), J. R. Statist. Soc. B 39, 1–38, 1977.
4. Diaconis, P., Group Representations in Probability in Statistics, Institute of Mathematical Statistics, Hayward, 1988.
5. Diaconis, P., A generalization of spectral analysis with application to ranked data, Ann. Math. Statist. 17, 949–979, 1989.