Giełwanowska, I., Kellmann-Sopyła, W., (2015). Polish Polar Research 36(3), 261-279. De Gruyter Open, Warsaw, Poland. English language
Farco, G. E., Sosa, M. M., Dematteis, M., Fernández, A., (2012). South African Journal of Botany 78, 21-29. Elsevier Ltd, Oxford, UK. English language
Ma GuoHua, Zhao NanXian, Huang XueLin, (2003). Journal of Tropical and Subtropical Botany 11(3), 255-259. South China Institute of Botany, Chinese Academy of Sciences, Guangzhou, China. Chinese language
Minne, L., Spies, J. J., Venter, H. J. T., Venter, A. M., (1994). Bothalia 24(1), 107-110. English language
(1994). Apomixis: exploiting hybrid vigor in rice., iv + 78 pp. International Rice Research Institute, Manila, Philippines. English language
Srivastava, A. K., Purnima, (1990). Acta Botanica Indica 18(2), 240-246. English language
Bhanwra, R. K., (1986). Current Science, India 55(20), 1033-1034. English language