(complete)
L Pandolfi 2008 Inverse Problems 24 015014
Th. M. Nieuwenhuizen 2009 EPL 86 59001
R A Treumann 2009 EPL 86 50000
Francis Halzen and Dan Hooper 2009 New J. Phys. 11 105019
E Askari et al 2008 J. Phys.: Conf. Ser. 125 012078
Hynek Baran 2005 J. Phys. A: Math. Gen. 38 L301