Ortega- Olivencia, A. and Romero García, A. T. (1989) “Palynology of the Brachypetalum Dunal section of the genus Helianthemum Miller (Cistaceae) in Eastern Andalusia”, Acta Botanica Malacitana, 14, pp. 231–237. doi: 10.24310/abm.v14i.9385.