Le caractère additif des déviations des anneaux locaux. Michel André (1982) Commentarii mathematici Helvetici
Locally complete intersection homomorphisms and a conjecture of Quillen on the vanishing of cotangent homology. Avramov, Luchezar L. (1999) Annals of Mathematics. Second Series
Lower bounds for Betti numbers Luchezar L. Avramov, Ragnar-Olaf Buchweitz (1993) Compositio Mathematica