1. Centers for Disease Control and Prevention. Prevention of perinatal group B streptococcal disease: a public health perspective;Mmwr,1996
2. Sociedad Catalana de Enfermedades Infecciosas y Microbiología Clínica, Obstetricia y Ginecología, y Pediatría. Recomanacions per la prevencio de la malaltia neonatal per estreptococ del grup b;Pediatria catalana,1998
3. Sociedad española de ginecología y obstetricia (sego), sociedad española de neonatologia,1998
4. Potential consequences of widespread antepartal use of ampicillin;Towers;Am j obstet gynecol,1998
5. Neonatal sepsis and death caused by resistant escherichia coli: possible consequences of extended maternal ampicillin administration;Terrone;Am j obstet gynecol,1999