Stacks of Stable Maps and Gromov-Witten Invariants
arXiv:alg-geom/9506023
Abstract
We correct some errors in the earlier version of this paper. Most importantly, the definition of isogeny of marked stable graphs has changed.
Postscript file available at http://www.math.ubc.ca/people/faculty/behrend/gwi.ps , AMSLaTeX