Gluon emission in interaction of two reggeons M. A. Braun, S. S. Pozdnyakov, M. Yu. Salykin and M. I. Vyazovsky Eur. Phys. J. C, 75 5 (2015) 222 Published online: 22 May 2015 DOI: 10.1140/epjc/s10052-015-3421-x