@article{
title = "A Partial Taxonomy of Substitutability and Interchangeability"
author = "S. Karakashian, R. Woodward, B. Y. Choueiry, S. D. Prestwich, E. C. Freuder"
year = "2010-01-01"
booktitle = "10th International Workshop on Symmetry in Constraint Satisfaction Problems" }