1. Anonymous. 2003. International rules for seed testing. Bassersdorf, Switzerland: The International Seed Testing Association (ISTA).
2. Atak, M., M.D. Kaya, G. Kaya, M. Kaya, and K.M. Khawar. 2008. Dark green seeds increase the seed vigor and germination ability in dry green pea (Pisum sativum L.). Pakistan Journal of Botany 40: 2345–2354.
3. Colete, J.C.F., R.D. Vieira, and A.S. Dutra. 2004. Electrical conductivity and soybean seedling emergence. Scientia Agricola (Piracicaba, Brazil) 61: 386–391.
4. Habib, M. 2010. Sugarbeet (Beta vulgaris L.) seed pre-treatment with water and HCl to improve germination. African Journal of Biotechnology 9: 1338–1342.
5. Hampton, J.G., and D.M. Tekrony. 1995. Handbook of vigour test methods, 3rd ed. Zurich: International Seed Testing Association.