Okla. Stat. tit. 84, § 84-260

in petition.

When such petition is filed, the party may proceed to make

service by publication upon such defendants, in the manner

following: The publication notice must, in such case, be addressed

in terms, to "the heirs, executors, administrators, devisees,

trustees and assigns, of __________ deceased" (naming such deceased

person). It shall be issued over the official signature of the clerk

of the court; shall state the court in which the petition is filed,

the name of the plaintiff, the above description of such defendants,

and must notify the defendants thus described that they have been

sued and must answer the petition filed by the plaintiff, on or

before a time to be stated (which shall not be less than forty-one

(41) days from the date of the first publication), or the petition

will be taken as true, and judgment, the nature of which shall be

stated, will be rendered accordingly. The publication must be made

three (3) consecutive weeks in some newspaper authorized by law to

publish notices in legal proceedings, printed in the county where

the petition is filed, if there be any printed in such county, and

if there be not, then in some newspaper printed in this state of

general circulation in that county. A copy of the publication

notice, with a copy of the petition (without exhibits), shall,

within six (6) days after the first publication of the notice is

made, be enclosed in an envelope and addressed to each of such

devisees, grantees, or heirs at law, as are named in the petition,

or his place of residence, postage prepaid, and deposited in the

nearest post office, unless such place of residence is unknown to

the plaintiff.