Assisted dynamical Schwinger effect: pair production in a pulsed bifrequent field Anatoly D. Panferov, Stanislav A. Smolyansky, Andreas Otto, Burkhard Kämpfer, David B. Blaschke and Łukasz Juchnowski Eur. Phys. J. D, 70 3 (2016) 56 Published online: 15 March 2016 DOI: 10.1140/epjd/e2016-60517-y