Journal article (2011) - Maurits W. Ertsen (author), Maurits Willem Ertsen (author), Maurits Ertsen (author), M. W. Ertsen (author), M.W. Ertsen (author), H Hoag (author)

Journal article (2009) - J Tempelhoff (author), H Hoag (author), J Ur (author), P van Dam (author), M Melosi (author), V Winiwarter (author), T Wilkinson (author), M. W. Ertsen (author), Maurits Willem Ertsen (author), Maurits W. Ertsen (author), Maurits Ertsen (author), M.W. Ertsen (author), E Arnold (author), M Bender (author), K Berry (author), C Fort (author), D Pietz (author), M Musemwa (author), M Nakawo (author)