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