1. D. Abramovich and A. Vistoli, Complete moduli for families over semistable curves, preprint
2. D. Abramovich and A. Vistoli, Compactifying the space of sta-ble maps, preprint
3. D. Abramovich, A. Corti, A. J. de Jong and A. Vistoli, Twisted bundles, admissible covers,and level structures, in preparation
4. V. Alexeev, Log canonical surface singularities, in: Flips and Abundance on Algebraic Threefolds, Astérisque 211, 1992
5. Valery Alexeev, Boundedness and K 2 for log surfaces, Inter-nat. J. Math. 5:6 (1994), 779–810