MÖLLER, M., et al. “PLASTID INHERITANCE IN STREPTOCARPUS (GESNERIACEAE) AND AN INFERRED HYBRID ORIGIN FOR A POPULATION OF S. AFF. PRIMULIFOLIUS FROM IGODA RIVER, SOUTH AFRICA”. Edinburgh Journal of Botany, vol. 60, no. 3, Apr. 2004, pp. 389-08, https://doi.org/10.1017/S0960428603000301.