M  Levin, Pukhov, A , Hubbard, RF , Kaganovich, D , Gordon, DF , Sprangle, P , Ting, A , Hafizi, B , and Zigler, A . 2005. ?Longitudinal Profiles Of Plasma Parameters In A Laser-Ignited Capillary Discharge And Implications For Laser Wakefield Accelerator Applications?. Applied Physics Letters, 87.