Wittmann on conductivity

M.C. Wittmann
Investigating Student Understanding of Quantum Physics: Models of Conductivity
Newsletter of the American Society of Black Physicists, special issue on physics education research, March (2001).

Prather and Harrington on Radioactivity

E.E. Prather and R.R. Harrington
Student Understanding of Ionizing Radiation and Radioactivity: Recognizing the Differences Between Irradiation and Contamination
Journal of College Science Teaching, 31:2, 89-93 (2001)