important reference
definitions
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A significant source of information, data, or authority used for consultation, study, or guidance.es: Referencia importante
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A significant mention or allusion to a particular subject, person, or event.es: Mención importante
examples
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His writings provided important reference for social reform.
Sus escritos proporcionaron una referencia importante para la reforma social.
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The speaker made an important reference to the recent economic crisis.
El orador hizo una mención importante a la reciente crisis económica.