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Husaini, S. W. H. & G. A. Iwo. 1990. Cytology of some weedy species of the family Compositae (Asteraceae) from Jos Plateau, Nigeria. Feddes Repert. 101: 49–62.
OLORODE, O. & D. J. OLOPADE. 1978. Contributions to the cytogenetics of Emilia Cass. I. Genome-dependent chiasma frequency and spontaneous chromosome aberrations. Cytologia 43: 497–504.