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First Author:
 
Francisco Sanchez-Sanchez
CIMAT
sanfco@cimat.mx
 
CIMAT, Jalisco s/n, Mineral de Valenciana, Apartado Postal 402
Guanajuato, 36240, Mexico
 
(52)473-732-71 55(Phone)
(52)473-732-71 55(Fax)