RCT: Heterologous AD5-nCOV plus CoronaVac versus homologous CoronaVac vaccination.

Heterologous AD5-nCOV plus CoronaVac versus homologous CoronaVac vaccination: a randomized phase 4 trial – Nature Medicine

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RCT: Heterologous (Pfizer, J&J, or AstraZeneca) vs. homologous COVID-19 booster vaccination in previous recipients of two doses of CoronaVac COVID-19 vaccine in Brazil.

Neutralizing antibodies against the SARS-CoV-2 Delta and Omicron variants following heterologous CoronaVac plus BNT162b2 booster vaccination – Nature Medicine

WHO issues interim recommendations for heterologous COVID-19 vaccine schedules.