Nguyet, V.T., Tua, T.V., Kien, N.T. and Kim, D.D. 2015. The use of Eichhornia crassipes in a surface flow wetland system for removing nitrogen and phosphorus of pig wastewater after anaerobic treatment (biogas) process. Academia Journal of Biology. 37, 1 (Aug. 2015), 53–59. DOI:https://doi.org/10.15625/0866-7160/v37n1.6047.