1. Abdullah AA, Pedersen S, Andersen SB (1994) Triploid and hexaploid regenerants from hexaploid Timothy (Phleum pratense) via anther culture. Plant Breed 112:342–345
2. AgriQuality (2007) Seed certification statistics 2006–2007. AgriQuality, New Zealand
3. Anonymous (2007) Appendix: Total world seed production (tonnes) of various grasses and clovers in the world and EU countries 1993–2006. In: Proceedings of the 6th international herbage seed conference, Norway, 2007
4. Barkworth ME, Capels KM, Long S, Anderton LK (2007) Flora of North America north of Mexico, vol 24: Magnoliophyta; Commelinidae (in part); Poaceae, part 1. Oxford University Press, Oxford, UK
5. Bondesen OB (2007) Seed production and seed trade in a globalised world. Seed production in the northern light. In: Proceedings of the 6th international herbage seed conference, Norway, pp 9–12