Eva R. Sansome, S. Satina, A. F. Blakeslee, Disintegration of Ovules in Tetraploid-Diploid and in Incompatible Species Crosses in Datura, Bulletin of the Torrey Botanical Club, Vol. 69, No. 6 (Jun., 1942), pp. 405-420
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Sansome et al. (1942) studied this question.