Zheng, Hongya, Baoming Li, Gang Chen, and Chaoyuan Wang. 2018. “Improving Utilization of Nests and Decreasing Mislaid Eggs With Narrow Width of Group Nests”. International Journal of Agricultural and Biological Engineering 11 (1):83-87. https://ijabe.migration.pkpps03.publicknowledgeproject.org/index.php/ijabe/article/view/3167.