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2. Systematic analysis of the Heliotropiaceae based on molecular and morphological–anatomical data;Diane N.;PhD thesis,2003
3. Die infragenerische Gliederung der Gattung Heliotropium L. und ihre Stellung innerhalb der subfam. Heliotropioideae (Schrad.) Arn. (Boraginaceae);Förther H.;Sendtnera,1998