What is the dissolved date of the parliament summoned on 28 February 1467?
CREATE TABLE "parliaments_of_king_edward_iv" (
  "summoned" text,
  "elected" text,
  "assembled" text,
  "dissolved" text,
  "1st_member" text,
  "2nd_member" text
);
SELECT "dissolved" FROM "parliaments_of_king_edward_iv" WHERE "summoned"='28 february 1467';