Can you tell me the Chassis that has the Points of 13, and the Year of 1975, and the Entrant of scuderia citta del mille?
CREATE TABLE "complete_european_formula_two_championsh" (
  "year" real,
  "entrant" text,
  "chassis" text,
  "engine" text,
  "points" real
);
SELECT "chassis" FROM "complete_european_formula_two_championsh" WHERE "points"=13 AND "year"=1975 AND "entrant"='scuderia citta del mille';