ABSTRACT
Ewa Wojcicka, the driving force behind this chapter, died January 14, 1996. She had suffered multiple severe injuries from an automobile accident near Savannah, Georgia. She was recovering remarkably well when yet another accident occurred in the rehabilitation clinic, and she died of the consequences. Ewa was responsible for much of the progress in domination critical graphs. A memorial page for her can be viewed on the World Wide Web at https://www.math.sc.edu/sumner/ewa.html">https://www.math.sc.edu/sumner/ewa.html .
