Yen, N. T., and L. V. Tri. “Economic Effects of the Organic-Microorganism Complex Fertilizer (omc) Supply and the Fito-Leafat Spray on the Growth and the Development of Cabbage and Chinese Lettuce Grown in Dong Anh District, Hanoi City”. Academia Journal of Biology, vol. 27, no. 4, Nov. 2014, pp. 81-87, doi:10.15625/0866-7160/v27n4.5292.