Chen, Danyan, Yuanyuan Feng, Ya Liu, Juan Hu, Shilong Li, Jingze Ma, Xinyu Lu, et al. 2023. “Effects of Urea-N and CO2 Coupling Fertilization on the Growth, Photosynthesis, Yield and Anthocyanin Content of Hydroponic Purple Cabbage Brassica Campestris Ssp. Chinensis”. International Journal of Agricultural and Biological Engineering 16 (5). Beijing, China:123-31. https://ijabe.org/index.php/ijabe/article/view/7566.