 Kọ itẹsiwaju fun paragirafi yii - Awọn ọkunrin 4x400 mita relay iṣẹlẹ ni 1990 World Junior Championships ni Athletics : ti waye ni Plovdiv, Bulgaria, ni Deveti Septemvri Stadium ni ọjọ 11 ati 12 Oṣu Kẹjọ. 