- ↑ a b Cabo Aseguinolaza, 2011, p. 2
- ↑ Cabo Aseguinolaza, 2011, pp. 181-202
- ↑ a b c Álvarez Barrientos, 1997, pp. 173-177
- ↑ Cabo Aseguinolaza, 2011, pp. 228-229
- ↑ Cabo Aseguinolaza, 2011, pp. 1822
- ↑ Cabo Aseguinolaza, 2011, pp. 230
- ↑ Cabo Aseguinolaza, 2011, p. 230
- ↑ a b Lázaro Carreter, 1965
- ↑ Cabo Aseguinolaza, 2011, p. 234
- ↑ Cabo Aseguinolaza, 2011, p. 259
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