- ↑ Galdós y del Moral, 2004.
- ↑ Gómez de la Serna, 1954, p. 47.
- ↑ Muñoz Marquina, 1988, p. 252.
- ↑ Altamira, 1905, pp. 192-198.
- ↑ Ortiz-Armengol, 2000, pp. 149 y ss.
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