Okla. Stat. tit. 84, § 84-253: Hearing, process and service

Upon the filing of such petition the judge of the district

court shall make an order fixing a day for the hearing of said

petition, not less than six nor more than ten (10) weeks from the

time of making such order, and directing all the heirs of such

deceased person and record claimant to lands or any part thereof of

which said decedent died seized to appear before the court at the

time and place specified, and to submit to the court evidence that

is competent to establish heirship of such deceased person. The

court shall cause notice of such hearing to be given by serving a

copy of said notice on the known heirs and record claimants of said

decedent's estate in the manner and within the time as provided for

service of summons in civil actions in the district court. The

service on unknown heirs and unknown claimants shall be had in the

same manner as is now provided for the service of summons in civil

actions in the district court for nonresident defendants. The

hearing shall be had on the date fixed by the court, except

continuances may be had for good cause shown, as in civil actions.