Neb. Rev. Stat. § 16-214: Neb. Rev. Stat. § 16-214

A city of the first class by ordinance may provide for issuing bonds, for the purpose of funding any and all indebtedness of the city, due or to become due. Floating indebtedness shall be funded only by authority of a vote of the people, but the mayor and city council may by a two-thirds vote issue bonds to pay off any bonded debt without a vote of the people.