Douglas Fisher Burns, J. C., Wagger, M. G., & Fisher, D. S. (2009). Animal and Pasture Productivity of 'Coastal' and 'Tifton 44' Bermudagrass at Three Nitrogen Rates and Associated Soil Nitrogen Status. AGRONOMY JOURNAL, 101(1), 32–40. https://doi.org/10.2134/agronj2008.0006x Fisher, D., Fleissig, A. R., & Serletis, A. (2001). An empirical comparison of flexible demand system functional forms. JOURNAL OF APPLIED ECONOMETRICS, 16(1), 59–80. https://doi.org/10.1002/jae.585 Fisher, D. (2001). Intermediate macroeconomics: A statistical approach. https://doi.org/10.1142/4530 Fisher, D., & Fleissig, A. R. (1997). Monetary aggregation and the demand for assets. JOURNAL OF MONEY CREDIT AND BANKING, 29(4), 458–475. https://doi.org/10.2307/2953708