Modelling of ammonia nitrogen in river using soft computing techniques Ren Jie Chin, Wing Son Loh, Voon Hao Chai, Bryan Seng Haw Yap, Kar Hui Chan and Britney Wan Xing Sim E3S Web Conf., 347 (2022) 04001 Published online: 14 April 2022 DOI: 10.1051/e3sconf/202234704001