(a) Whenever a governmental unit shall determine the need to issue revenue bonds for capital improvements of a public nature or industrial enterprise, the governing body shall authorize the issuance of those bonds by proclamation, order, ordinance, or resolution clearly stating the principal amount of and the purpose or purposes for which the bonds are to be issued.
(b) Only upon the proclamation, order, ordinance, or resolution of the governing body shall the governmental unit be authorized to issue such bonds, provided that no proclamation, order, ordinance, or resolution shall be required for the issuance of refunding bonds, including refunding bonds where the principal amount of the new bonds to be issued exceeds the outstanding principal amount of the prior bonds or notes to be refunded.