Okla. Stat. tit. 84 § 274
Upon the filing of the petition in an action authorized to be brought pursuant to Section 271.1 or 273 of this title, the clerk of the court shall issue summons as in other civil cases, requiring the persons named to appear and answer as in other civil cases, and in like manner the clerk shall also issue a summons for publication, setting forth briefly the contents of the petition, for all persons interested in the property to appear and answer within thirty (30) days from the date of first publication, which summons shall be published as required in other civil suits except that it shall not be required to be published exceeding thirty (30) days before answer required. If the petition has been filed by the district attorney for the county where the property is located, a summons and a copy of the petition shall be sent by certified mail, return receipt requested, to the Attorney General of this state.
Okla. Stat. tit. 84, § 274