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Ultrasonic energy as a tool to overcome some drawbacks in the determination of lead in brain tissue and urine of rats, Guimar\'e3es, D., Santos J. P., Carvalho M. L., Vale G., Santos H. M., Geraldes V., Rocha I., and Capelo J. L. , Talanta, Volume 86, p.442-446 , (2011)\par \par }