The Antitrust Equal Enforcement Act : hearings before the Committee on the Judiciary, United States Senate, Ninety-seventh Congress, first and second sessions on S. 995, a bill to provide for contribution of damages attributable to an agreement by two or more persons to fix, maintain, or stabilize prices under section 4, 4A, or 4C of the Clayton Act, April 22, May 11, and December 7, 1981, and February 10, 1982