Recommended Citation
Postprint version. Published in Naturwissenschaften, Volume 77, Issue 11, November 1, 1990, pages 536-538. Copyright © 1990 Springer. The original publication is available at http://dx.doi.org/10.1007/BF01139266.
Disciplines
Physics
URL: http://digitalcommons.calpoly.edu/phy_fac/134