Neb. Rev. Stat. §§ 14-3,119
Petitions for improvements provided for under sections 14-384 to 14-3,127 shall be examined and certified for sufficiency as the city may provide. Certificates as to sufficiency when properly filed as provided by the city shall be prima facie evidence of the truth and correctness of the matter certified in such petition. If such certificates show the petition for any improvement to be irregular, illegal, or insufficient it shall be the duty of the city to give notice by publication for three successive days in the official newspaper of the city of such irregularity, illegality, or insufficiency and the property owners within any improvement district may at any time file supplemental petitions for such improvement and such supplemental petitions shall be considered and taken as a part of the original petition. Such supplemental petitions shall be examined and certified as in the case of the original petition.
Neb. Rev. Stat. §§ 14-3,119