Abstract
- Received 23 February 1960
DOI:https://doi.org/10.1103/PhysRevLett.4.380
©1960 American Physical Society
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This article appears in the following collection:
Letters from the Past - A PRL Retrospective
2008 marked PRL’s 50th anniversary. As part of the celebrations a collection of milestone Letters was started. The collection contains Letters that have made long-lived contributions to physics, either by announcing significant discoveries, or by initiating new areas of research.
