1. Celaya, P., R. Tkatch, Y.C. Zhu and R. Patwardhan (2004). Closed-loop identification at the Hovensa Refinery. NPRA Plant Automation & Decision Support Conference, September 19 – 22, 2004, San Antonio, Texas, USA.
2. Celaya, P., V. Marrero, R. Tkatch and R. Patwardhan (2005) Closed-loop identification of a FCC unit. NPRA Q&A and Technology Forum, Plant Automation & Decision Support Sessions, October 18 – 21, 2005, Grapevine, Texas.
3. Cutler, C.R. and R.B. Hawkins (1988). Application of a large predictive multivariable controller to a hydrocracher second stage reactor. Proceedings of American Control Conference, pp. 284-291.
4. Multivariable step testing for MPC projects reduces crude unit testing time;Kalafatis;Hydrocarbon Processing,2006
5. Kautzman G. W, W. Korchinski and M. Brown (2006) Faster plant testing and modelling: Automated technology performs both open-loop and closed-loop testing simultaneously. Hydrocarbon Processing, October, 2006.