Former of Turn Trajectory of Sliding Valve Shaft of Gas LineVladislav. Yu. Dementyev, Nikolay. V. Gusev, Nikolay. V. Koyain and Sergey. Yu. ShiryaevMATEC Web Conf., 91 (2017) 01038DOI: https://doi.org/10.1051/matecconf/20179101038