@inproceedings{DAC-1968-Lewis,
	author        = "Albert D. M. Lewis",
	booktitle     = "{Proceedings of the Fifth Design Automation Workshop}",
	doi           = "10.1145/800167.805413",
	publisher     = "{ACM}",
	title         = "{Backtrack programming in welded girder design}",
	year          = 1968,
}