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Ultrasound spectroscopy as an alternative method to measure..:

Waldjânio de Oliveira Melo ; Bruno Moura Monteiro ; Luciara Celi da Silva Chaves...
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782018000200753&lng=en&tlng=en.  , 2018