R. Pallares, J. Liñares, M. Vadillo, C. Cabellos, F. Manresa et al., Resistance to Penicillin and Cephalosporin and Mortality from Severe Pneumococcal Pneumonia in Barcelona, Spain, New England Journal of Medicine, vol.333, issue.8, pp.474-480, 1995.
DOI : 10.1056/NEJM199508243330802

J. Hofmann, M. Cetron, M. Farley, W. Baughman, R. Facklam et al., In Atlanta, New England Journal of Medicine, vol.333, issue.8, pp.481-486, 1995.
DOI : 10.1056/NEJM199508243330803

A. Fenoll, M. Bourgon, C. Muñoz, R. Vicioso, D. Casal et al., Serotype Distribution and Antimicrobial Resistance of Streptococcus pneumoniae Isolates Causing Systematic Infections in Spain, 1979-1989, Clinical Infectious Diseases, vol.13, issue.1, pp.56-60, 1979.
DOI : 10.1093/clinids/13.1.56

R. Muñoz, T. Coffey, M. Daniels, C. Dowson, G. Laible et al., Intercontinental Spread of a Multiresistant Clone of Serotype 23F Streptococcus pneumoniae, Journal of Infectious Diseases, vol.164, issue.2, pp.202-206, 1991.
DOI : 10.1093/infdis/164.2.302

E. Bamett, J. Klein, and D. Teele, Pneumococcal vaccine for olympic athletes and visitors to Spain, N Engl J Med, vol.326, issue.23, p.1572, 1992.

E. Martínez and M. A. , Pneumococcal vaccination and travel to Spain, The Lancet, vol.340, issue.8815, p.378, 1992.
DOI : 10.1016/0140-6736(92)91461-G

L. Louzao and J. , Streptococcus pneumoniae: mecanismos de resistencia a macrólidos y relación con el consumo de dichos antibióticos. Implicaciones terapéuticas. [Streptococcus pneumoniae: mécanismes de résistance aux macrolides et rapport avec la consommation de ces antibiotiques. Implications thérapeutiques, Anales, p.180, 1993.

D. Price and S. , Studies in Scientometrics. Part I: Transience and continuance in scientific authorship Little Science, Big Science... and beyond [b] Price DJ de S. Studies in Scientometrics. Part II: The relation between source author and cited author populations A dynamic look at a class of skew distributions. A model with scientometric applications Publication dynamics: models and indicators, International Journal of Information Sciences for Decision Making Page Price DJ de S. Little Science, Big Science ... and beyond, pp.149-167, 1984.

J. Irwin, The Place of Mathematics in Medical and Biological Statistics, Journal of the Royal Statistical Society. Series A (General), vol.126, issue.1, pp.1-45, 1963.
DOI : 10.2307/2982445

E. Barnett and J. Klein, Pneumococcal vaccination for travel to Spain, The Lancet, vol.340, issue.8820, p.681, 1992.
DOI : 10.1016/0140-6736(92)92225-5

E. Bamett, J. Klein, and D. Teele, Pneumococcal vaccine for olympic athletes and visitors to Spain, N Engl J Med, vol.326, issue.23, p.1572, 1992.

J. Casal, J. Fenoll, M. Vicioso, and R. Muñoz, INCREASE IN RESISTANCE TO PENICILLIN IN PNEUMOCOCCI IN SPAIN, The Lancet, vol.333, issue.8640, p.735, 1989.
DOI : 10.1016/S0140-6736(89)92260-5

C. Dowson, A. Hutchinson, J. Brannigan, R. George, D. Hansman et al., Horizontal transfer of penicillin-binding protein genes in penicillin-resistant clinical isolates of Streptococcus pneumoniae., Proceedings of the National Academy of Sciences, vol.86, issue.22, pp.8842-8846, 1989.
DOI : 10.1073/pnas.86.22.8842

A. Fenoll, M. Bourgon, C. Muñóz, R. Vicioso, D. Casal et al., Serotype Distribution and Antimicrobial Resistance of Streptococcus pneumoniae Isolates Causing Systematic Infections in Spain, 1979-1989, Clinical Infectious Diseases, vol.13, issue.1, pp.56-60, 1979.
DOI : 10.1093/clinids/13.1.56

G. Leoni, M. Cercenado, E. Rodeno, P. Dequiros, J. Martínez et al., Susceptibility of Streptococcus pneumoniae to Penicillin: A Prospective Microbiological and Clinical Study, Clinical Infectious Diseases, vol.14, issue.2, pp.427-435, 1992.
DOI : 10.1093/clinids/14.2.427

C. Latorre-otín, J. Morros, T. , S. Sala, and I. , isolates from paediatric patients, Journal of Antimicrobial Chemotherapy, vol.22, issue.5, pp.659-665, 1988.
DOI : 10.1093/jac/22.5.659

F. Manresa, J. Dorca, J. Liñares, J. Martin, R. Martin et al., EMPIRICAL TREATMENT OF PNEUMOCOCCAL PNEUMONIA IN SPAIN, The Lancet, vol.333, issue.8650, pp.1338-1339, 1989.
DOI : 10.1016/S0140-6736(89)92743-8

E. Martínez, P. Domingo, and M. A. , Prieumococcal bacteraemia in immunocompetent adults, The Lancet, vol.337, issue.8732, p.57, 1991.
DOI : 10.1016/0140-6736(91)93381-I

E. Martínez and M. A. , Pneumococcal vaccination and travel to Spain, The Lancet, vol.340, issue.8815, p.378, 1992.
DOI : 10.1016/0140-6736(92)91461-G

P. Mendelman, J. Campos, D. Chaffin, D. Serfass, A. Smith et al., Relative penicillin G resistance in Neisseria meningitidis and reduced affinity of penicillin-binding protein 3., Antimicrobial Agents and Chemotherapy, vol.32, issue.5, pp.706-709, 1988.
DOI : 10.1128/AAC.32.5.706

R. Muñoz, T. Coffey, M. Daniels, C. Dowson, G. Laible et al., Intemational spread of a multiresistant clone of serotype 23F Streptococcus pneumoniae, J Infect Dis, vol.164, pp.202-206, 1991.

R. Pallares, F. Gudiol, J. Liñares, J. Ariza, G. Rufi et al., Risk Factors and Response to Antibiotic Therapy in Adults with Bacteremic Pneumonia Caused by Penicillin-Resistant Pneumococci, New England Journal of Medicine, vol.317, issue.1, pp.18-22, 1987.
DOI : 10.1056/NEJM198707023170104

J. Pérez, J. Liñares, J. Bosch, L. De-goicoechea, M. Martín et al., in childhood carriers, Journal of Antimicrobial Chemotherapy, vol.19, issue.2, pp.278-280, 1986.
DOI : 10.1093/jac/19.2.278

A. Plasencia, A. Segura, J. Farrés, and J. Cuervo, Pneumococcal vaccine for olympic athletes and visitors to Spain Outbreaks of intensive pneumococcal disease in a jail -Texas, N Engl J Med MMWR, vol.327, issue.3843, p.437, 1989.

C. Sánchez, R. Armengol, J. Lite, I. Mir, and J. Garau, Penicillin-resistant pneumococci and community-acquired pneumonia, The Lancet, vol.339, issue.8799, p.988, 1992.
DOI : 10.1016/0140-6736(92)91560-U