@article {2603, title = {Synergistic Laser-Wakefield and Direct-Laser Acceleration in the Plasma-Bubble Regime}, journal = {Phys. Rev. Lett. }, volume = {114}, number = {184801}, year = {2015}, url = {http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.114.184801}, author = {Xi Zhang and Vladimir N. Khudik and Gennady Shvets} }