Readers should cite both the Bio-protocol preprint and the original research article where this protocol was used:

Wolff, G and Bárcena, M(2021). Cell culture, infection and vitrification. Bio-protocol Preprint. bio-protocol.org/prep872.
Wolff, G., Limpens, R. W. A. L., Zevenhoven-Dobbe, J. C., Laugks, U., Zheng, S., Jong, A. W. M. D., Koning, R. I., Agard, D. A., Grünewald, K., Koster, A. J., Snijder, E. J. and Bárcena, M.(2020). A molecular pore spans the double membrane of the coronavirus replication organelle. Science. DOI: 10.1126/science.abd3629