World-sheet instantons and the Peccei-Quinn symmetry

Wen, X.-G. ; Witten, E.

Amsterdam : Elsevier

ISSN:	0370-2693
Source:	Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
Topics:	Physics
Type of Medium:	Electronic Resource
URL:	http://dx.doi.org/10.1016/0370-2693(86)91587-X