"Particle Induced Erosion of Be, C and W in Fusion Plasmas. 
 Part A: Chemical Erosion of Carbon-Based Materials"
 A.A.Haasz, J.A.Stephens, E.Vietzke, W.Eckstein, J.W.Davis and Y. Hirooka.
 Atomic and Plasma-Material Interaction Data for Fusion, Vol. 7, 
 Part A, 1 (1998).