1. Agresti A (1990) Categorical data analysis. Wiley, New York
2. Ares JO, Beeskow AM, Bertiller MB, Rostagno CM, Irisarri MP, Anchorena J, Defossé GE, Merino CA (1990) Structural and dynamics characteristics of overgrazed grasslands of northern Patagonia. In: Breymeyer A (ed) Managed grassland: regional studies. Elsevier, Amsterdam
3. Beaty ER, Powell JD (1976) Response of Switchgrass (Panicum virgatum L.) to clipping frequency. J Range Manage 29(2):132–135
4. Becker GF, Busso CA, Montani T (1997) Effects of defoliating Stipa tenuis and Piptochaetium napostaense at different phenological stages: I. axillary bud viability and growth. J Arid Environ 35:233–250
5. Briske DD, Anderson VJ (1992) Competitive ability of the bunchgrass Schizachyrium scoparium as affected by grazing history and defoliation. Vegetatio 103:41–49