1. Ahloowalia, B. S. (1965). Cytogenetic studies on natural hybrids between ryegrass and meadow fescue.Z. Vererb.-Lehre 97: 226?242.
2. Ahloowalia, B. S. (1966). Chromosome pairing in aneuploid perennial ryegrass.J. Hered. 57: 129?134.
3. Ahloowalia, B. S. (1967). Colchicine induced polyploids in ryegrass.Euphytica 16: 49?60.
4. Barcley, P. C. &J. M. Armstrong, (1966). Certain aspects of chromosome number and seed size in induced tetraploid pasture plants.Proc. 10th Intern. Grassl. Congr. Helsinki. 667?671.
5. de Roo, R. (1952). Het verwekken van tetraploidie in enkele voedergewassen door middel van colchicine.Meded. Landb. Hoogesch. Opzoekstns. Gent 17: 281?292.