On a Residue Representation of Deformation, Koszul and Chiral Rings
  A residue-theoretic representation is given for massless matter fields in (quotients) of (weighted) \CY\ complete intersection models and the corresponding chiral operators in \LGO{s}.   The well known polynomial deformations are thus generalized and the universal but somewhat abstract Koszul computations acquire a concrete realization and a general but more heuristic reinterpretation.   A direct correspondence with a BRST-type analysis of constrained systems also emerges naturally. 
P. Berglund and T. Hubsch