Feigl, Ludwig
Yudin, Petr
Stolichnov, Igor
Sluka, Tomas
Shapovalov, Konstantin
Mtebwa, Mahamudu
Sandu, Cosmin S.
Wei, Xian-Kui
Tagantsev, Alexander K.
Setter, Nava
Article History
Received: 4 February 2014
Accepted: 11 July 2014
First Online: 14 August 2014
Competing interests
: The authors declare no competing financial interests.