Han, L., H. Mao, J. Hu, and K. Tian. ā€œDevelopment of a Doorframe-Typed Swinging Seedling Pick-up Device for Automatic Field Transplantationā€. Spanish Journal of Agricultural Research, Vol. 13, no. 2, May 2015, p. e0210, doi:10.5424/sjar/2015132-6992.