Determination of rare earth elements in the biological reference materials Pine Needles and Spruce Needles by neutron activation analysis

1998 ◽  
Vol 233 (1-2) ◽  
pp. 59-61 ◽  
Author(s):  
C. N. Machado ◽  
S. P. Maria ◽  
M. Saiki ◽  
A. M. G. Figueiredo
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