@TechReport{The_Planes_System_Natural_Language_Access_to_a_Large_Data_Base,
	author = "David Lee Waltz, Tim Finin, Fred Green, Forrest Conrad, Bradley Goodman, and George D. Hadden",
	title = "{The Planes System: Natural Language Access to a Large Data Base}",
	month = "November",
	year = "1976",
	organization = "Coordinated Science Laboratory",
	number = "T-34",
	institution = "University of Illinois, Urbana Champaign",
}