F. Wittmann, G. Van Zijl; Van Zijl, G.; Wittmann, F.; Wittmann, F.H; International Union of Testing and Research Laboratories for Materials and Structures Staff; RILEM Technical Committee 208-HFC Staff; Wittman, F.H.
Wolfgang J. Junk, Maria T. F. Piedade, Florian Wittmann, Jochen Schöngart, Pia Parolin; Junk, Wolfgang J.; Piedade, Maria T. F.; Parolin, Pia; Schöngart, Jochen; Wittmann, Florian