Reference
S. J. S. Bradshaw andP. J. C. Child,Optoelectronics 1 (1969) 45–48.
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Thetford, A. Optical addition and subtraction. Opto-electronics 1, 120 (1969). https://doi.org/10.1007/BF01418104
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DOI: https://doi.org/10.1007/BF01418104