Okla. Stat. tit. 11, § 11-32-112: Limitation on suits contesting establishment of the

district.

No suit shall be maintained in any court to enjoin or in any way

contest the establishment of parking stations or the establishment

of an improvement district unless the suit be instituted and summons

served within thirty (30) days after the date of the filing of a

petition for the improvement with the municipal clerk, or within

thirty (30) days after the date of the public hearing on the

advisability of the improvement.