Quality control of food products purchased by the National School-Feeding Programme in Pernambuco, Northeast Brazil, from 1985 to 1988

N.B. Guerra , E.M.F. Pires , G. de C. Martins , J.B. Lima Filho , G.N.B. Guerra , L.B. Borges , M.O.C. Tavares , M.L.Cavalcante , A.B. de Melo Filho , A.R. de Oliveira , M.M. Becerra , S.C. de Melo Filho , V.A. Silva