1. Aschoff, J., 1960, Exogenous and endogenous components in circadian rhythms, Cold Spring Harbor Symp. Quant. Biol. 25: 11–28.
2. Batschelet, E., 1965, Statistical methods for the analysis of problems in animal orientation and certain biological rhythms, American Institute of Biological Sciences Monograph, Washington, D.C.
3. Batschelet, E., 1972, Recent statistical methods for orientation data, in: Animal Orientation and Navigation (S. R. Galler, K. Schmidt-Koenig, G. J. Jacobs, and R. E. Belleville, eds.), NASA SP-262, U. S. Government Printing Office, Washington, D. C., pp. 61–91.
4. Brines, M. L., 1978, Skylight polarization patterns as cues for honeybee orientation: Physical measurements and behavioral experiments, Thesis, Rockfeller University, Appendix B.
5. Butler, R. F., and Banerjee, S. K., 1975, Theoretical single-domain grain size range in magnetite and titanomagnetite, J. Geophys. Res. 80: 4049–4058.