Volpp J., Gatzen M., Vollertsen F.Simplified Analytical Modeling Of Dynamic Behavior Of The Keyhole For Different Spatial Laser Intensity Distributions During Laser Deep Penetration Welding (The Paton Welding Journal, 2013, №03)
Thomy C., Kohn H., Vollertsen F.Application Of High-power Fibre Lasers In Laser And Laser-mig Hybrid Welding 31 (The Paton Welding Journal, 2006, №07)