@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",
	booktitle = "Department of Computer and Information Science, Technical Report No. MS-CIS-88-22.",
	institution = "University of Pennsylvania",
}