Storage of pollens for long-term conservation of yam genetic resources, Ng, N. Q. and Daniel, I.*, in: Cryopreservation of tropical plant germplasm-current research progress and application. Tsukuba, Japan; Rome, Italy: Japan International Research Center for Agricultural Sciences (JIRCAS); International Plant Genetic Resources Institute (IPGRI), pages 136-139, 2000.
Potential of seed storage for long-term conservation of yam germplasm, Daniel, I.*, Ng, N. Q. and Tayo, T., in: Root crops and poverty alleviation: proceedings of the Sixth Triennial Symposium of the International Society for Tropical Root Crops�Africa Branch (ISTRC�AB), Lilongwe, Malawi, 22�28 October 1995, pages 409-411, International Institute of Tropical Agriculture: ISTRC�AB, 1998.