What circuit did emilio de villota win on at the pace petroleum trophy?
CREATE TABLE "races" (
  "round" real,
  "name" text,
  "circuit" text,
  "date" text,
  "winning_driver" text,
  "winning_car" text
);
SELECT "circuit" FROM "races" WHERE "winning_driver"='emilio de villota' AND "name"='pace petroleum trophy';