What was the Mixed doubles that has a Women's players of maria gomes zamy gomes, and men's players of fernando silva ricardo fernandes?
CREATE TABLE "past_winners" (
  "year" real,
  "men_s_singles" text,
  "women_s_singles" text,
  "men_s_doubles" text,
  "women_s_doubles" text,
  "mixed_doubles" text
);
SELECT "mixed_doubles" FROM "past_winners" WHERE "women_s_doubles"='maria gomes zamy gomes' AND "men_s_doubles"='fernando silva ricardo fernandes';