A robust possibilistic programming model for water allocation problem Mohamadreza Fazli-Khalaf, Karo Fathollahzadeh, Amir Mollaei, Bahman Naderi and Mohammad Mohammadi RAIRO-Oper. Res., 53 1 (2019) 323-338 Published online: 15 February 2019 DOI: 10.1051/ro/2018058