Sepúlveda J, López M, Frenk J, Gómez de León J, Lezana MA, Santos-Burgoa C. Key issues in public health surveillance for the 1990's. MMWR Morb Mortal Wkly Rep 1992;41 Supplement:61-76.

Sepúlveda J, López M, Frenk J, Gómez de León J, Lezana MA, Santos-Burgoa C. Key issues in public health surveillance for the 1990's. MMWR Morb Mortal Wkly Rep 1992;41 Supplement:61-76

Sepúlveda J, López M, Frenk J, Gómez de León J, Lezana MA, Santos-Burgoa C. Key issues in public health surveillance for the 1990's. MMWR Morb Mortal Wkly Rep 1992;41 Supplement:61-76.