W. R. Sharp, D. K. Dougall, E. F. Paddock, Haploid Plantlets and Callus from Immature Pollen Grains of Nicotiana and Lycopersicon, Bulletin of the Torrey Botanical Club, Vol. 98, No. 4 (Jul. - Aug., 1971), pp. 219-222
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Sharp et al. (1971) studied this question.