Variable-structure PI controller for tank level process. - Igor M. Boiko; Xi Sun; Edgar Tamayo (ACC, 2008)

Performance analysis and tuning of variable-structure PID controllers for level process. - Igor Boiko; Xi Sun; Edgar Tamayo (CCA/ISIC, 2009)

Modified relay feedback test: Industrial loop tuner implementation and experiments. - Igor Boiko; Andrew Ernyes; Worku Oli; Edgar Tamayo (ACC, 2009)