Comparisons between radial basis function and multilayer perceptron neural networks methods for nitrate and phosphate detections in water supply by Md. Yunus, Mohd. Amri, Faramarzi, Mahdi, Ibrahim, Sallehuddin, Altowayti, Wahid Ali Hamood, Goh, Pei San, Mukhopadhyay, Subhas Chandra