Svedhem, H., Titov, D. V., Mccoy, D., Lebreton, J. P., Barabash, S., Bertaux, J. L., et al. (2007). Venus express - The first European mission to Venus. Planetary and Space Science, 55(12), 1636-1652. doi:10.1016/j.pss.2007.01.013.