1. Chida, Y., Development of an automatic harvester of spinach based on passive handling, Journal of the Japan Society for Precision Engineering, Vol.81, No.9 (2015), pp.815-818 (in Japanese).
2. Fujisawa, A., Chida, Y. and Iizuka, K., Behavior analysis of soil by motion of a root-cutting blade in soil for an automatic spinach harvester, Transaction of the JSME (in Japanese), Vol. 81, No.832 (2015), DOI:10.1299/transjsme.15-00298.
3. Hatakeyama, T., Fujisawa, A., Yamaguchi, T., Chida, Y., Ozawa, T., Angle tracking control of the root cutting blade of an automatic spinach harvester, Proceedings of Symposium of SICE Chubu branch (2015), pp.5-8 (CD-ROM) (in Japanese).
4. Hatakeyama, T., Hirano, K., Nakamura, Y., Fujisawa, A., Tsuchiya, T., Yamaguchi, T., Chida, Y., Control of the root cutting blade in the soil of an automatic spinach harvester, The 3rd Multi-symposium on Control Systems (2016), PS-26 (CD-ROM) (in Japanese).
5. Hirakasa-net, available from <http://www.hirakasa.net> (in Japanese) (accessed on 6 March, 2015).