1. AUDUS, L.J. (1960): Magnetotropism a new plant-growth response. Nature (Lond.), 185: 132?134.
2. BARNOTHY, M.F. and SUMEGI, I. (1969): Abnormalities in organs of mice induced by a magnetic field. Nature (Lond.), 221: 270?271.
3. BARTELS, J. (1957): The geomagnetic measures for the time-variations of solar-corpuscular radiation, described for use in correlation studies in other geophysical fields. Ann. Int. Geophys. Year, 1957?58. Pergamon Press, Oxford, IV: 227?36.
4. CHAPMAN, S. (1951): The Earth's Magnetism. Methuen, London, pp. 127.
5. FARADAY, M. (1951): Experimental Researches in Electricity, 1839?55. Everyman edition, Dent, London, 32?47.