Gauquelin, N.
Hawthorn, D. G.
Sawatzky, G. A.
Liang, R. X.
Bonn, D. A.
Hardy, W. N.
Botton, G. A.
Article History
Received: 9 August 2013
Accepted: 2 June 2014
First Online: 15 July 2014
Competing interests
: The authors declare no competing financial interests.