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Jowitt, P. W., & Xu, C. (1990). Optimal Valve Control in Water‐Distribution Networks. Journal of Water Resources Planning and Management, 116(4), 455–472. doi:10.1061/(asce)0733-9496(1990)116:4(455) 
10.1061/(asce)0733-9496(1990)116:4(455)