Name the author for peri and april 2010
CREATE TABLE "series_1" (
  "num" real,
  "series_sorted" text,
  "title" text,
  "author" text,
  "doctor" text,
  "featuring" text,
  "released" text
);
SELECT "author" FROM "series_1" WHERE "featuring"='Peri' AND "released"='April 2010';