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Shahin Zarre-Mobarakeh, Systematic Revision of Astragalus sect. Adiaspastus, sect. Macrophyllium and sect. Pterophorus (Fabaceae), Englera, No. 18, Systematic Revision of Astragalus sect. Adiaspastus, sect. Macrophyllium and sect. Pterophorus (Fabaceae) (2000), pp. 3-219
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Shahin Zarré (2000) studied this question.
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