Pérez-Trallero, E., Fernández-Mazarrasa, C., García-Rey, C., Bouza, E., Aguilar, L., García-de-Lomas, J., & Baquero, F. (2001). Antimicrobial Susceptibilities of 1,684 Streptococcus pneumoniae and 2,039 Streptococcus pyogenes Isolates and Their Ecological Relationships: Results of a 1-Year (1998–1999) Multicenter Surveillance Study in Spain. American Society for Microbiology.

Pérez-Trallero, E., C. Fernández-Mazarrasa, C. García-Rey, E. Bouza, L. Aguilar, J. García-de-Lomas, và F. Baquero. Antimicrobial Susceptibilities of 1,684 Streptococcus Pneumoniae and 2,039 Streptococcus Pyogenes Isolates and Their Ecological Relationships: Results of a 1-Year (1998–1999) Multicenter Surveillance Study in Spain. American Society for Microbiology, 2001.

Pérez-Trallero, E., et al. Antimicrobial Susceptibilities of 1,684 Streptococcus Pneumoniae and 2,039 Streptococcus Pyogenes Isolates and Their Ecological Relationships: Results of a 1-Year (1998–1999) Multicenter Surveillance Study in Spain. American Society for Microbiology, 2001.