Andrea Castelletti Francesca Pianosi Rodolfo Soncini-Sessa Integration, participation and optimal control in water resources planning and management. 21-33 2008 206 Applied Mathematics and Computation 1 http://dx.doi.org/10.1016/j.amc.2007.09.069 db/journals/amc/amc206.html#CastellettiPS08a