Links:
[1] https://www.die.upm.es/en/node/2637
[2] https://www.die.upm.es/en/content/andr%C3%A9s-santos-y-lle%C3%B3
[3] https://www.die.upm.es/en/perfil/pedro-guerra-gutierrez-1
[4] https://www.die.upm.es/sites/default/files/thesis_g.sportelli_lowres.pdf