CREATE TABLE table_3243 ("Round" FLOAT, "Circuit" TEXT, "Date" TEXT, "Pole Position" TEXT, "Fastest Lap" TEXT, "Winning Driver" TEXT, "Winning Team" TEXT)

On the Circuit Zolder who was the winning team?
SELECT "Winning Team" FROM table_3243 WHERE "Circuit" = 'Circuit Zolder'
SELECT "Winning Team" FROM "table_3243" WHERE "Circuit" = 'Circuit Zolder'