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A. G. Underbrink, Rhoda C. Sparrow, A. H. Sparrow, H. H. Rossi, Relative Biological Effectiveness of X-Rays and 0.43-MeV Monoenergetic Neutrons on Somatic Mutations and Loss of Reproductive Integrity in Tradescantia Stamen Hairs, Radiation Research, Vol. 44, No. 1 (Oct., 1970), pp. 187-203
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Underbrink et al. (1970) studied this question.
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