Hussain, S.W., Richardson, K., Faville, M. and Woodfield, D. 2006. Production of haploids and double haploids in annual (Lolium multiflorum) and perennial (L. perenne) ryegrasses. NZGA: Research and Practice Series. 12, (Jan. 2006), 45–48. DOI:https://doi.org/10.33584/rps.12.2006.3048.