23rd International Conference on Integrable Systems and Quantum Symmetries (ISQS), Prague, Çek Cumhuriyeti, 23 - 27 Haziran 2015, cilt.670
A class of semi-discrete chains of the form l(1x) = f(x, t, ti, G) is considered. For the given chains easily verifiable conditions for existence of x-integral of minimal order 4 are obtained.