@inproceedings{STOC-1980-Pippenger,
	author        = "Nicholas Pippenger",
	booktitle     = "{Proceedings of the 12th Annual ACM Symposium on Theory of Computing}",
	doi           = "10.1145/800141.804684",
	pages         = "351--356",
	publisher     = "{ACM}",
	title         = "{Comparative Schematology and Pebbling with Auxiliary Pushdowns}",
	year          = 1980,
}