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An indicator to quantify the international diffusion of domestic literature is proposed. It is based on the proportion of articles from a comprehensive domestic database covered by international specialised databases, and is applied to the fields of Physics and Chemistry. The trend to publish abroad in both fields is also introduced. These two indicators are studied for different Spanish sectors: university, research council and industry.

Se analiza la producción científica de la Universidad española en el campo de la Física, y en el período 1986-88, a través de dos bases de datos: INSPEC, que recoge lo publicado en revistas extranjeras y también, aunque de modo selectivo, en cierto número de revistas españolas; e ICYT, que recoge exhaustivamente todos los trabajos originales publicados en revistas españolas. La comparación entre ambas series de datos permite deducir tendencias de publícación en el extranjero. Asimismo se analizan comparativamente los periodos 1982-85 y 1986-88, con los datos obtenidos de INSPEC.

Analyses journal demand received by one of Spain′s two document supply centres in one year. Examines data in the following categories: most frequently requested subjects, age of documents, countries where the original journals are published, the most requested foreign and Spanish journals, and the fields of activity of the users.