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X. Jarque, Z. Nitecki.
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J. Llibre, J. S. Pérez del Río, J. Á. Rodríguez.
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J. Llibre, J. S. Pérez del Río, J. Á. Rodríguez.
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J. Soler.
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A. E. Teruel.
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PhD thesis, Universitat Autònoma de Barcelona, 2000. (In Spanish)
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Ll. Alsedà, M. Chas, J. Smital.
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