Implementing an economic approach to settling countervailing duty disputes ; Evidence from the U.S. cases against Canadian hogs and pork / Erna van Duren, Larry Martin, Heather Meek. -- Guelph : University of Guelph, 1990. -- 21 s. : 4 tab. -- (Working papers series 28/1990). ošípané * mäso bravčové * clá * obchod zahraničný