Who are the writers of the episode titled "Mac Bangs Dennis' Mom"?
CREATE TABLE "table1_29273115_1" (
  "no_in_series" real,
  "no_in_season" real,
  "title" text,
  "directed_by" text,
  "written_by" text,
  "original_air_date" text,
  "production_code" text
);
SELECT "written_by" FROM "table1_29273115_1" WHERE "title"='\"Mac Bangs Dennis'' Mom\"';