Atkinson, P. W., Asteraki, E. J., Conway, G. J., Fuller, R. J., Goodyear, J., Smith, R. E. N., Tallowin, J. R. B., Vickery, J. A. (2002). Use of grassland by wintering birds: effects of management on their food resources. BGS Occasional Symposium, Conservation Pays? Reconciling environmental benefits with profitable grassland systems. Proceedings of the joint British Grassland Society / British Ecological Society Conference, University of Lancaster, 15-17, Frame, J. ISBN:0905944402, 36, 61-64