The provisions of this subchapter shall be effective with respect to bonds, notes, or certificates which have heretofore been approved by referendum authorizing bonds in coupon and registered form, or in coupon form only, and such bonds, notes, or certificates need not be resubmitted for a further vote or referendum for the purpose of authorizing the bonds, notes, or certificates in registered form or book entry form only. (Added 1983, No. 24, § 1, eff. April 6, 1983.)