Recommended Citation
Postprint version. Published in Lettere Al Nuovo Cimento, Volume 1, Issue 8, February 20, 1971, pages 336-338.
NOTE: At the time of publication, the author Richard B. Frankel was not yet affiliated with Cal Poly.
The definitive version is available at https://doi.org/10.1007/BF02784686.
Disciplines
Physics
Copyright
1971 Springer.
URL: https://digitalcommons.calpoly.edu/phy_fac/180
