00455nam a22001697a 4500003000400000005001700004008004100021020001500062040000800077082002200085100002700107245006600134250001000200260003600210300001100246650002800257OSt20220525111426.0030206s2002 ck 000 0 spa d a9682300924 cOSt04221a350.827bT6771 aTorres Gaytan, Ricardo00aTeoría del comercio Internacional / cRicardo Torres Gaytan a9 ed. aMéxico : bSiglo XXI, c1980. a467 p.042LEMBxCOMERCIO EXTERIOR