1 Peter J. R. Challen (USA). Some news on welding and welders / Peter J. R. Challen // J. Soc. Occup. Med. – 1974. – Vol. 24. – P. 38–47. 2. (Цит. праця) – Paton B. E. Prospects of welding development / B. E. Paton // Weld in the World. – 1973. – Vol. 1, № 9. – P. 259–270. |