Conference paper (2004) - P.A. van der Duin (author), A.L Porter (author), H. Linstone (author), V. Marchau (author), G. Massari (author), I. Miles (author), M. Mogee (author), A. Salo (author), F. Scapolo (author), R. Smits (author), W.A.H. Thissen (author), W. Bradford Ashton (author), G. Clar (author), J.F. Coates (author), K. Cuhls (author), S.W. Cunningham (author), K. Ducatel (author), L. Georgehiou (author), T. Gordon (author)

Journal article (2004) - AL Porter (author), P.A. van der Duin (author), H. Linstone (author), V.A.W.J. Marchau (author), G. Massari (author), I. Miles (author), M. Mogee (author), A. Salo (author), F. Scapolo (author), R. Smits (author), W.A.H. Thissen (author), W.B. Ashton (author), G. Clar (author), J.F. Coates (author), K. Cuhls (author), S. Cunningham (author), K. Ducatel (author), L. Georgehiou (author), T. Gordon (author)