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In: Commutative algebra: syzygies, multiplicities, and birational algebra (South Hadley, MA, 1992), Contemp. Math. 159, Amer. Math. Soc., Providence, RI, (1994), 1-13.
Adv. Math. 133 (1998), 54-95.
Proc. London Math. Soc. (3) 75 (1997), 241-270.