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245	0	0	_aUmbral Cientifico _h[electronic resource].
260		1	_aBogotá : : _bUniversidad Manuela Beltrán
500			_aTitle from content provider.
538			_aMode of access: World Wide Web.
650	1	4	_aRevistas electronicas.
655		0	_aElectronic journals.
856	4	0	_uhttp://www.umb.edu.co/actualizaciones/inv-umbral.htm
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999			_c8110 _d8110