Pinheiro, J. C. and Bates, D. M. (2000), Mixed-Effects Models in S
and S-PLUS, Springer, New York. (Appendix A.26)
Devore, J. L. (2000), Probability and Statistics for
Engineering and the Sciences (5th ed), Duxbury, Boston, MA.
Details
Devore (2000, Example 10.10, p. 427) cites data from an article in
Materials Evaluation on ``a study of travel time for a certain
type of wave that results from longitudinal stress of rails used for
railroad track.''