Scattering of relativistic electron beam by two counter-propagating laser pulses: A new approach to Raman X-ray amplificationI.A. Andriyash, Ph. Balcou, E. d'Humières and V.T. TikhonchukEPJ Web of Conferences, 59 (2013) 18004DOI: https://doi.org/10.1051/epjconf/20135918004