[9] Nymphas E F, Adeniyi M O, Ayoola M A, et al.Journal of Atmospheric and Solar-Terrestrial Physics, 2009, 71(12): 1245.
[10] Founda D, Melas D, Lykoudis S, et al.Atmospheric Chemistry and Physics, 2007, 7(21): 5543.
[11] Anderson J.Weather, 1999, 54(7): 207.