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| 041 | _aspa | ||
| 082 | _aIBM4381 | ||
| 245 | 0 | _aSITESIS DE LABORES DEL PROYECTO DE INVESTIGAC | |
| 250 | _aS.E. | ||
| 260 | _aS.L. | ||
| 260 |
_aSin Pais _bESPOL _c1984 |
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| 942 | _c01 | ||
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| 999 |
_c212221 _d212221 |
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