In People v. Vera (1997) 15 Cal. 4th 269 ,the Supreme Court held: "When the defendant seeks to bifurcate the determination of the truth of the prior conviction allegation from determination of the defendant's guilt of the charged crimes, however, only the statutory right to jury trial is implicated in the trial of the sentencing allegations. Since there is no constitutional right to have the jury determine the truth of a prior conviction allegation citation, it follows that the failure to obtain an express, personal waiver of the right to jury trial of prior conviction allegations does not constitute a violation of the state constitutional mandate." (Ibid.)