Calleja, Fabian
Ochoa, Héctor
Garnica, Manuela
Barja, Sara
Navarro, Juan Jesús
Black, Andrés
Otrokov, Mikhail M.
Chulkov, Evgueni V.
Arnau, Andrés
Vázquez de Parga, Amadeo L.
Guinea, Francisco
Miranda, Rodolfo
Article History
Received: 19 June 2014
Accepted: 30 October 2014
First Online: 15 December 2014
Competing interests
: The authors declare no competing financial interests.