Department of Physics Papers

Document Type

Journal Article

Date of this Version

5-1988

Publication Source

Superstrings ’88

Start Page

276

Last Page

287

Abstract

Lecture presented at the Spring School on Superstrings, Trieste, April 1988.

Comments

At the time of publication, author Philip C. Nelson was affiliated with Boston University. Currently, he is a faculty member in the Physics & Astronomy Department at the University of Pennsylvania.

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Date Posted: 01 May 2017