An, Ngo, Lan, Ngo, Cong, Vo, Duong, Nong, AND Huong Giang, Nguyen. " Environmental Pressure from Pig Farming to Surface Water Quality Management in Yen Dung District Bac Giang Province" VNU Journal of Science: Earth and Environmental Sciences [Online], Volume 36 Number 1 (15 March 2020)