References

• A. Mirme et al. "A wide range multi-channel Air Ion Spectrometer" In: Boreal Env. Res. 12 (2007), pp. 247–264.
• U. Hõrrak. "Air ion mobility spectrum at a rural area". PhD thesis. University of Tartu, 2001.
• Meelis Eller. "Signal processing in aerosol fast measurements". MA thesis. Estonia: University of Tartu, 2008.