@TechReport{A_Hierarchical_Database_Model_for_a_Logic_Programming_Language,
	author = "Tim Finin and James McGuire",
	title = "{A Hierarchical Database Model for a Logic Programming Language}",
	month = "March",
	year = "1988",
	organization = "Department of Computer and Information Science",
	number = "MS-CIS-88-22",
	institution = "University of Pennsylvania",
}