Barabash, S., Sauvaud, J. A., Gunell, H., Andersson, H., Grigoriev, A., Brinkfeldt, K., et al. (2007). The analyser of space plasmas and energetic atoms (ASPERA-4) for the Venus express mission. Planetary and Space Science, 55(12), 1772-1792. doi:10.1016/j.pss.2007.01.014.