CILLA, G., PÉREZ-TRALLERO, E., ARTIEDA, J., SERRANO-BENGOECHEA, E., MONTES, M., & VICENTE, D. (2007). Marked decrease in the incidence and prevalence of hepatitis A in the Basque Country, Spain, 1986–2004. Cambridge University Press.

CILLA, G., E. PÉREZ-TRALLERO, J. ARTIEDA, E. SERRANO-BENGOECHEA, M. MONTES, and D. VICENTE. Marked Decrease in the Incidence and Prevalence of Hepatitis A in the Basque Country, Spain, 1986–2004. Cambridge University Press, 2007.

CILLA, G., et al. Marked Decrease in the Incidence and Prevalence of Hepatitis A in the Basque Country, Spain, 1986–2004. Cambridge University Press, 2007.