The use of the structural approach in assessing the effectiveness of gas and ion nitriding steels - O. V. Sobol; A. A. Andreev; S. V. Shepel; V. V. Dmitrik; N. A. Pogrebnoj; G. I. Ishchenko; S. A. Knjazev; N. V. Pinchuk; A. A. Mejlekhov; V. A. Stolbovoj; M. O. Sologub; N. A. Krivobok (Physical surface engineering, 2015)