%0 conference paper,conference lecture,GKSS report %@ %A Yuan, H.,Cornec, A. %D 1990 %J ECF 8: Fracture behaviour and design of materials and structures: Preprints of the 8th Biennal European Conference on Fracture %N %P 873-878 %T On the significance of elastic-plastic crack propagation velocity in asymptotic solutions %U %X