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3. 3) F. Vollertsen, J Schumacher, K. Schneider and T. Seefeld: Innovative Welding Strategies for the Manufacture of Large Aircraft, Proceedings IIW international Conference (2004).
4. 4) G. Arakane, S. Tsukamoto, I. Kawaguchi and H. Honda: Porosity Formation in Full Penetration Welding of Thick Plates Using High Power CO2 Laser, Journal of the High Temperature Society, 29-4 (2003), 164-170. (in Japanese)
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