1. E. J. MITTEMEIJER, H. C. F. ROZENDAAL, P. F. COLIJN, P. J. VAN DER SCHAAF, and R. Th. FURNÉE: in ‘Heat treatment ’81’, 107-115; 1983, London, The Metals Society.
2. ‘Source book on nitriding’; 1977, Metals Park, OH, American Society for Metals.
3. H. DETTNER and J. ELZE: ‘Handbuch der Galvanotechnik’, Vol. 2, 102; 1966, Munich, Carl Hanser Verlag.
4. Metallographic analysis of compound layers on ferritic nitrocarburized plain low carbon steel