@article{Woodbury2018, author = "Robert F. Woodbury and Carnegie Mellon University.Engineering Design Research Center.", title = "{Variations in solids : a declarative treatment}", year = "2018", month = "4", url = "https://kilthub.cmu.edu/articles/journal_contribution/Variations_in_solids_a_declarative_treatment/6076283", doi = "10.1184/R1/6076283.v1" }