2. A. B-I, **Some Mathematics for Radiation Therapy**, lecture at

3. Y. Censor, A. B-I, Y. Xiao and J.M.
Galvin, **On Linear Infeasibility Arising in Intensity
Modulated Radiation Therapy Inverse Planning**, *Lin. Algeb. and its Appl*. **428**(2008), 1406-1420