1. The causes of deafness in pediatric otolaryngology;Adams,1987
2. Hearing loss in infancy and the neonatal intensive care unit;Alberti,1988
3. Childhood deafness in the European Community;Commission of the European communities;Eur 6413,1979
4. The Causes of Profound Deafness in Childhood;Fraser,1976
5. Institute Nacional de Estatistica, Anuário Estatistico (Portugal), 1987.