Fco Antonio Escribano Risquez, 17 Dec 2014 http://link.springer.com/chapter/10.1007/978-1-4684-2106-4_3 .
Fco Antonio Escribano Risquez, 17 Dec 2014 http://link.springer.com/chapter/10.1007/978-1-4684-2106-4_3 .