Journal article (2009) - Ger J.M. Koper (author), Ger J M Koper (author), Ger Koper (author), GJM Koper (author), G.J.M. Koper (author), C.B. Minkenberg (author), IS Upton (author), Jan van Esch (author), J.H. Van Esch (author), Jan Van Esch (author), Jan H. Van Esch (author), J.H. van Esch (author), Jan H. van Esch (author), Ernst J.R. Sudholter (author), Ernst J.R. Sudholter (author), EJR Sudhölter (author), EJR Sudhölter (author), Ernst J. R. Sudhölter (author), Ernst J. R. Sudhölter (author), E.J.R. Sudhölter (author), E.J.R. Sudhölter (author), EJR Sudholter (author), EJR Sudholter (author), Ernst J. R. Sudholter (author), Ernst J. R. Sudholter (author), Ernst Sudhölter (author), Ernst Sudhölter (author), E.J.R. Sudholter (author), E.J.R. Sudholter (author), Ernst Sudholter (author), Ernst Sudholter (author), Ernst J.R. Sudhölter (author), Ernst J.R. Sudhölter (author)