1. Arslan, S., & Colvin, T. (2002). Grain yield mapping: Yield sensing, yield reconstruction, and errors. Precision Agriculture, 3(2), 135–154.
2. Chosa, T., Kobayashi, K., Daikoku, M., Shibata, Y., & Omine, M. (2002). A study on yield monitoring system for head-feeding combines (Part 1): Adoption of an optical sensor and a load cell as a yield monitor. Journal of the Japanese Agricultural Machinery, 64(6), 145–153.
3. Iida, M., Yao, Y., Nonami, K., Kimura, A., Kaho, T., & Umeda, M. (2004). Impact type grain flow rate sensor for combine. Journal of the Japanese Society of Agricultural Machinery, 66(6), 145–151.
4. Lee, C. K., Iida, M., Kaho, T., & Umeda, M. (2000). Development of impact type yield sensor for head feeding combine. Journal of the Japanese Agricultural Machinery, 62(4), 81–88.
5. Microsoft. (2012). About solver. Accessed on August 17, 2012, from http://office.microsoft.com/en-us/excel-help/about-solver-HP005198368.aspx .