CA Gov't Code Section 8878.118

Any bonds issued and sold pursuant to this article may be refunded by the issuance of refunding bonds in accordance with Article 6 (commencing with Section 16780) of Chapter 4 of Part 3 of Division 4. Approval by the electors of the state for the issuance of these bonds shall include the approval of any bonds issued to refund any bonds originally issued or previously issued refunding bonds.