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3. D. Abramovich, T. Graber and A. Vistoli, Gromov–Witten theory of Deligne–Mumford stacks, preprint. arXiv:math/ 0603151, Amer. J. Math., to appear.
4. D. Abramovich and A. Vistoli, Complete moduli for fibered surfaces. Recent progress in intersection theory (Bologna, 1997), 1–31, Trends Math., Birkhäuser Boston, Boston, MA, 2000.
5. D. Abramovich and A. Vistoli, Compactifying the space of stable maps. J. Amer. Math. Soc. 15 (2002), no. 1, 27–75.