In any proceeding involving the validity or enforcement of or relating to any contract of the authority, the authority is conclusively deemed to have been established and authorized to transact business and exercise its powers upon proof of the adoption of a resolution by the governing body declaring the need for the authority. The resolution is sufficient if it declares that there is such need for an authority and finds in substantially the terms of Section 34242 that either or both of the conditions set forth in that section exist in the county or city. A copy of the resolution duly certified by the clerk is admissible in evidence in any proceeding.