J. D. Hooker, Indian Species of Impatiens. Generis Impatiens Species Indicae novae et minus rite cognitae a cl. a. meebold detectae, Bulletin of Miscellaneous Information (Royal Botanic Gardens, Kew), Vol. 1910, No. 8 (1910), pp. 291-300
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J. D. Hooker (1910) studied this question.