1. Using yield prediction models to assess yield gains: a case study for wheat;Bell;Field Crop Res.,1994
2. Measuring the contribution of new varieties to increasing wheat yields;Brennan;Rev. Marketing Agric. Econ.,1984
3. The rate of crop varietal replacement on farms: measures and empirical results for wheat;Brennan;Plant Varieties Seeds,1991
4. An economic framework for evaluating new wheat varieties;Brennan;Rev. Marketing Agric. Econ.,1989
5. Technology transfer systems for improved crop management: Lessons for the future;Byerlee,1994