Conference paper (2013) - LA van Paassen (author), Leon A. van Paassen (author), Leon van Paassen (author), L.A. van Paassen (author), P.J. Vardon (author), P. J. Vardon (author), Philip J. Vardon (author), Phil J. Vardon (author), Phil Vardon (author), A. Mulder (author), G van der Weg (author), P Jeffrey (author)