What's the 2001 census of the region of Abruzzo where the 1871 census is bigger than 51092.0?
CREATE TABLE "references" (
  "num" real,
  "city" text,
  "1981_census" real,
  "1991_census" real,
  "2001_census" real,
  "2010_est" real,
  "region" text
);
SELECT MIN("2001_census") FROM "references" WHERE "region"='Abruzzo' AND "1981_census">51092.0;