Here are just some of the reasons why:
G Brodin and M Marklund 2008 New J. Phys. 10 115031
Evelyne Roueff and Eric Herbst 2009 J. Phys.: Conf. Ser. 192 012008
Svjetlan Feretić and Anthony J Guttmann 2009 J. Phys. A: Math. Theor. 42 485003
A Jeanson et al 2009 J. Phys.: Conf. Ser. 190 012185
J R Verkouteren et al 2008 Meas. Sci. Technol. 19 115101
John Abelson et al 2007 J. Phys.: Condens. Matter 19 450301
Andrew Randono 2008 Class. Quantum Grav. 25 235017
Wei Guo and Herbert H Sawin 2009 J. Phys. D: Appl. Phys. 42 194014
M X Shi et al 2009 J. Phys.: Condens. Matter 21 455301
A Di Cicco and A Filipponi 2009 J. Phys.: Conf. Ser. 190 011001