James H. Graham Mostafa S. Mostafa Benjamin Arazi Ashraf Tantawy Jeffrey L. Hieb Patricia A. S. Ralston Sandip C. Patel Improvements in SCADA and DCS Systems Security. 194-200 2007 conf/cata/2007 Computers and Their Applications db/conf/cata/cata2007.html#GrahamMATHRP07