M. I.  Mazuritskiy, Lerer, A. M., Marcelli, A., Dabagov, S. B., Coreno, M., and D?Elia, A., ?Coherent Excitation of X-Ray Fluorescence and Interference of Radiation at the Output of Polycapillary Structures?, JETP Letters, vol. 107, pp. 600-605, 2018.