Ratnanik, R. et al. 2018. KAJIAN OPTIMALISASI DISTRIBUSI JARINGAN AIR BERSIH (STUDI KASUS PDAM DELTA TIRTA SIDOARJO UNIT IPA KRIAN): Study on Water Distribution Network Optimization (A Case Study in the Sidoarjo Drinking Water Company of the Subdistric of Krian). Spektrum Sipil. 5, 1 (Sep. 2018), 1–10. DOI:https://doi.org/10.29303/spektrum.v5i1.130.