1. Arsenault J L, Pouleur S, Messier C and Guay R (1995). WinRHIZ O, a root-measuring system with a unique overlap correction method. Hort. Sci. 30: 906
2. Baan Hofman T and Ennic G C (1980). Investigation into plant characters affecting the competitive ability of perennial ryegrass (Lolium perenne L.). Neth. J. Agr. Sci. 30: 97–109
3. Baan Hofman T and Ennic G C (1982). The effect of root mass of perennial ryegrass (Lolium perenne L.) on the competitive ability with respect to couch grass (Elytrigia repens (L.) Desv.). Neth. J. Agr. Sci. 30: 275–283
4. Barber S A and Silberbush M (1984). Plant root morphology and nutrient uptake. In: Kral, D M (eds) Roots, Nutrient and Water Influx and Plant Growth: Proceedings of a Symposium, pp 65–87. American Society of Agronomy, Madison
5. Barrett D J and Gifford R M (1999). Increased C-gain by an endemic Australian pasture grass at elevated atmospheric CO2 concentration when supplied with non-labile inorganic phosphorus. Aust. J. Plant Physiol. 26: 443–451