1. Simpson P.G.,Induction Heating -Coil and System Design,Mc Graw Hill,1960, New York, USA, p.304;
2. Rudnev V.,Loveless D.,Cook R.,Black M.,Handbook of Induction Heating,Marcel Dekker Inc.,New York, 2003,p.800;
3. Welding Handbook,Ninth Edition,Volume 4,Materials and Applications, Part 1, American Welding Society, Annette O , Brien -Editor,Miami, Fl, USA,2011,p.860;
4. Sindo Kou, Welding Metallurgy, Second Edition,Wiley-Interscience,2003,Hobeken, New Jersey, USA,p.466;
5. N.A. Shamov, V.I.Lunin and N.V. Ivanov: High frequency metal welding, (Leningrad, Masinostroenie, 1997) p.p.3-198;