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| Antonio Ruiz-Porras |
| Universidad de Guadalajara, CUCEA |
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| Universidad de Guadalajara, CUCEA |
| Periferico Norte 799 |
| Núcleo Universitario Los Belenes |
| Zapopan, Jalisco 45100 |
| Mexico |
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| starp2000@yahoo.com |
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JEL Areas: C : Mathematical and Quantitative Methods G : Financial Economics |