A DEADLOCK-FREE SCHEME FOR RESOURCE LOCKING IN A DATA BASE ENVIRONMENT.CHAMBERLIN DD; BOYCE RF; TRAIGER IL et al.1974; IN: INF. PROCESS. 74. INT. FED. PROCESS. CONGR.; STOCKHOLM; 1974; AMSTERDAM; NORTH HOLLAND PUBL.; DA. 1974; PP. 340-343; BIBL. 2 REF.Conference Paper

SPECIFYING QUERIES AS RELATIONAL EXPRESSIONS: THE SQUARE DATA SUBLANGUAGE.BOYCE RF; CHAMBERLIN DD; KING WF III et al.1975; COMMUNIC. A.C.M.; U.S.A.; DA. 1975; VOL. 18; NO 11; PP. 621-628; BIBL. 20 REF.Article