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The Brazilian time and frequency atomic standards program.
Ahmed M, Magalhães DV, Bebeachibuli A, Müller ST, Alves RF, Ortega TA, Weiner J, Bagnato VS. Ahmed M, et al. Among authors: magalhaes dv. An Acad Bras Cienc. 2008 Jun;80(2):217-52. doi: 10.1590/s0001-37652008000200002. An Acad Bras Cienc. 2008. PMID: 18506250 Free article.