Citation rate is narrower than share of voice — it counts only the answers that explicitly attribute your domain as a source. A brand can be mentioned (share) without being linked (citation). Both matter; citations drive referral traffic.
Raising citation rate is mostly about machine-trust signals: canonical URLs, last-updated timestamps, author bylines, and JSON-LD that identifies the author as a Person with sameAs links. Content quality being equal, the better-attributed page wins the citation.