S. Palaniyappan, R. Mitchell, R. Sauer, I. Ghebregziabher, S. L. White, M. F. Decamp and B. C. Walker, "Ionization of methane in strong and ultrastrong relativistic fields", Phys. Rev. Lett. 100, 183001 (2008).

I.Ghebregziabher and B. C. Walker, "Impact of coherence in radiation from ultrahigh-field atomic ionization", Phys. Rev. A 77, 023417 (2008).

E. Gagnon, A.S. Sandhu, A. Paul, K. Hagen, A. Czasch, T. Jahnke, P. Ranitovic, C.L. Cocke, B. Walker, M.M. Murnane and H.C. Kapteyn, "Time-resolved momentum imaging system for molecular dynamics studies using a tabletop ultrafast extreme-ultraviolet light source", Review of Scientific Inst. 79, 063102 (2008).

I. Ghebregziabher and B. C. Walker, "Effect of focal geometry on radiation from atomic ionization in an ultrastrong and ultrafast laser field", Phys. Rev. A 76, 023415 (2007).

B. A. Reagan, T. Popmintchev, M. E. Grisham, D. M. Gaudiosi, M. Berrill, O. Cohen, B. C. Walker, M. M. Murnane, J. J. Rocca and H. C. Kapteyn, "Enhanced high-order harmonic generation from Xe, Kr, and Ar in a capillary discharge", Phys. Rev. A 76, 013816 (2007).