Assessment of the service degradation of a gas pipeline steel by destructive and non-destructive method - Yu. V. Milman; H. M. Nykyforchyn; K. E. Hrinkevych; O. T. Tsyrulnyk; I. V. Tkachenko; V. A. Voloshyn; L. V. Mordel (Materials Science (Physicochemical mechanics of materials), 2011)