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2. Influence of artificial air ionisation on the human electroencephalogram;Assael;Int. J. Biometeorol.,1974
3. Ions for Breathing;Bach,1967
4. Some effects of air ions on the activity of rats;Bachman;Int. J. Biometerol.,1966
5. The effects of electrical fields and negative ion concentrations on test pilots;Barron;Aerospace Med.,1963