Logunov DY, Dolzhikova IV, Shcheblyakov DV, Tukhvatulin AI, et al. Safety and efficacy of an rAd26 and rAd5 vector-based heterologous prime-boost COVID-19 vaccine: an interim analysis of a randomised controlled phase 3 trial in Russia. Lancet 2021 Feb 2. pii: S0140-6736(21)00234.
PMID: 33545094