1. Björnsson, H. and Thorvaldsson, G. 1983.Prófanir à stofnum af vallarfoxgrasi, vallarsveifgrasi og túnvingli 1955–1975. (Variety trials in timothy, meadow grass and red fescue 1955–1975)139 Fjölrit Rala no. 103
2. Experimental Designs
3. Quality of herbage at different latitudes.
4. Dennis, B. and Helgadóttir, Á. Breeding herbage species for northern Scandinavia. Natural variation and breeding for adaptation. pp.169–178. Proceedings of the EUCARPIA Foder Crops Section Meeting, 22nd–24th September 1987. Lusignan, France