Recommended Citation
Postprint version. Published in Nature, Volume 23, Issue 4951, September 19, 1964.
Page 1281.
NOTE: At the time of publication, the author Harold Cota was not yet affiliated with Cal Poly.
The definitive version is available at https://doi.org/10.1038/2031281a0.
Disciplines
Civil and Environmental Engineering
Copyright
1964 Nature Publishing Group.
URL: https://digitalcommons.calpoly.edu/cenv_fac/106
