by Galland, S, Clayman, R.H, Zietman, A.L, Shipley, W.U, Russell, A.H, Heney, N.M, Kaufman, D.S, Whu, C, Gakis, G, Efstathiou, J.A
Published in International journal of radiation oncology, biology, physics (01.10.2013)

by Sundar, CS, Bharathi, A, Ching, WY, Jean, YC, Hor, PH, Meng, RL, Huang, ZJ, Chu, CW
Published in Physical review. B, Condensed matter (01.06.1991)