References
- Swedish patent 128,554 . French patents 904.407, 993.963 and 1018.908
- SUTTON , R. M. 1938 . Demonstration experiments in physics 294 New York MACKAY, R. STUART, 1959, Amer. J. Phys., 27, 185
- ÖHMAN , Y. 1959 . Pop. astr. Tidskr. , 40 : 36 According to recent brief communications from the Soviet Union, preliminary experiments in the same field have been made independently at the Stockholm Observatory
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