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Calero Carballo, Petra Ornella Advisor: González Valle, Fernando ; Gracia Molina, Anselmo Issued date: 2002 Tesis doctoral
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Advisor: Gracia Molina, Anselmo ; González Valle, Fernando Issued date: 1999 Tesis doctoral
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Advisor: Gracia Molina, Anselmo Issued date: 1995 Tesis doctoral
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