The mayor and city council of any city of the first class exercising authority to make improvements as provided under section 16-617 shall, by ordinance, create an improvement district or districts. After the passage, approval, and publication of such ordinance, the city clerk shall publish notice of the creation of any such district or districts one time each week for not less than twenty days in a legal newspaper in or of general circulation in the city.
Neb. Rev. Stat. §§ 16-619