Jianhong Lu Laijiu Chen Sujin Zhao Yiqian Wu Multivariable Fuzzy PID Control System for Deaerator's and Condenser's Levels in a Thermal Powerunit. 483-506 2002 33 Cybernetics and Systems 5 db/journals/cas/cas33.html#JianhongLSY02 http://dx.doi.org/10.1080/01969720290040704