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First Author:
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| Marcelo Brutti Righi |
| Universidade Federal de Santa Maria |
| marcelobrutti@hotmail.com |
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| Santa Maria, 97015-372, Brazil |
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| +55 55 32209258(Phone) |
| +55 55 32209258(Fax) |
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Second Author:
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| Paulo Sergio Ceretta |
| Universidade Federal de Santa Maria |
| ceretta10@gmail.com |
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