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Bruce, W. R.; Pearson, M. L.; Freedhoff, Helen S. (August 1963). "The Linear Power Switch Distributions Resulting from Primary and Scattered X-Rays and Gamma Rays with Primary HVL's from 1.25 mm Cu to 11 mm Pb". Freedhoff, Helen; Kranendonk, J. Van (Might 1967). "Principle of Coherent Resonant Absorption and Emission at Infrared and Optical Frequencies". Canadian Journal of Physics. Forty five (5): 1833-1859. Bibcode:1967CaJPh..45.1833F. Freedhoff, Helen S. (1 March 1979). "Collective atomic eff...
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