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Latin American applied research
Print version ISSN 0327-0793On-line version ISSN 1851-8796

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LU, X. Y.; JIA, Z. H.; LI, J. W.  and  ZHANG, F. C.. Lat. Am. appl. res. [online]. 2012, vol.42, n.1, pp.61-64. ISSN 0327-0793.


 


 

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