Nebraska Revised Statute 17-168
The mayor and council of a city of the second class adopting the proposition to make such purchase, or to erect such facility or facilities, set forth in section 17-164, before the purchase can be made or facility created, must submit the question to the electors of such city at a general municipal election or at an election duly called for that purpose and such question approved by a majority of the electors voting on it. If the question is submitted at a special election, the vote for the purchase or acquisition of such real estate or the purchase or erection of such facility or facilities shall equal at least a majority of the votes cast at the last preceding general election. Notice of the time and place of the election shall be given by publication in some legal newspaper printed and in general circulation in such city three successive weeks prior thereto.
Laws 1957, c. 29, § 6, p. 188.