Journal article (2012) - S Aksu (author), M Nahid Hasan (author), W.R. Hagen (author), WR Hagen (author), Wilfred R. Hagen (author), Fred Hagen (author), Frank Hollmann (author), F. Hollmann (author), F Hollmann (author), D. Sordi (author), Roger Arthur Sheldon (author), RA Sheldon (author), Roger A. Sheldon (author), Roger Sheldon (author), R.A. Sheldon (author), I. W.C.E. Arends (author), I.W.C.E. Arends (author), Isabel Arends (author), Isabel W.C.E. Arends (author), IWCE Arends (author)