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Kilian, N. and Galbany-Casals, M. and Oberprieler, Christoph (2010) Helichrysum nicolai (Compositae, Gnaphalieae), systematics of a new dwarf local endemic of the Cape Verde Islands, W Africa. Folia Geobotanica 45, pp. 183-199.
Meister, J. and Hubaishan, M. and Kilian, N. and Oberprieler, Christoph (2006) Temporal and spatial diversification of the shrub Justicia areysiana Deflers (Acanthaceae) endemic to the monsoon affected coastal mountains of the southern Arabian Peninsula. Plant Systematics and Evolution 262 (3-4), pp. 153-171.