Nguyen CH, Nguyen NT. Modifying the hemagglutinin gene with the packaging signals to improve the ability of replication in eggs of IBT-RG02 vaccine virus strain. Vietnam J. Biotechnol. [Internet]. 2023 Dec. 30 [cited 2025 Sep. 21];21(4):637-43. Available from: https://vjbt.vast.vn/vjbt/article/view/19661