Purpose This paper aims to carry out a literature review on the implementation of digital preservation policies, strategies and actions by institutional repositories. The objective is to identify, out of the published experiences, at which level they are fulfilling the function of ensuring the long-term availability of the deposited materials. Design/methodology/approach Using a systematic literature review methodology, a total of 21 articles from international refereed journals published between 2009 and 2020 are reviewed. Findings The research production on this subject is very limited. The scarce number of published articles proves that the interest of repository managers has been focused on issues other than to assure the long-term availability of the assets they store. The literature review has not found clear evidence about how institutional repositories are implementing digital preservation. It is particularly striking the lack of works focused on the situation in European countries. More field studies are needed. They would allow to extract conclusions and produce best practices to help managers to improve preservation strategies. Originality/value This study has shown that one of the main functions of repositories is not being dealt with as promised by repository managers. More work in this area is needed. In particular, it is necessary for a study at the European level to gather detailed data that will allow to draw a portrait of the current situation, extract conclusions and produce best practices to help managers to improve or develop preservation strategies.

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ResumenSe describe RePEc (Research Papers in Economics), uno de los repositorios temáticos más antiguos y con más contenido de los existentes. Se presta especial atención a los servicios de valor añadido que ofrece y que convierten a RePEc en una iniciativa única, con una gran aceptación dentro de su disciplina. Finalmente se hace una breve referencia al modelo de negocios que se utiliza y que se basa en el trabajo voluntario de miles de personas de todo el mundo. Palabras claveRepositorios temáticos, Economía, Repec, Servicios, Comunidad investigadora. AbstractWe describe RePec (Research Papers in Economics), one of the oldest subjet repositories and with more contens as well. Special attention is paid to the addes value services offered that make RePec a unique initiative with great acceptance within their discipline. Finally there is a brief reference to the business mdel used which is based on the voluntary work of thousands of people around the world. KeywordsSubject repository, Economics, Repec, Services, Research comunity. 1.-IntroducciónCuando se intenta sistematizar los tipos de repositorios es habitual hacer una distinción entre temáticos e institucionales. Los primeros se caracterizan por ser reducidos en número pero muy grandes en cuanto a contenidos, por haber sido los primeros en desarrollarse, por ocupar los primeros puestos en los rankings de repositorios o por ser los que gozan de mayor éxito entre la comunidad científica internacional. Mientras los segundos no han parado de crecer en los últimos años, sus contenidos son escasos, atraen poco interés por de los investigadores y están faltos de agregadores verdaderamente útiles que ofrezcan un punto de acceso único a las colecciones.Entre los primeros se encuentra RePEc (Research Papers in Economics) 1 , la iniciativa que es objeto de este trabajo y en la que el autor del mismo colabora activamente desde su creación. En concreto, con el desarrollo de un índice de citas que se describirá en la sección tres. RePEc and how to provide value-added services a community of researchers

This paper studies the main characteristics of the citation indexes currently developed in Spain. The paper compares the impact factors offered by Spanish citation indexes with the impact factor of Spanish journals also collected by the JCRs of the ISI (SCI and SSCI) over a five-year period (2001)(2002)(2003)(2004)(2005). Spanish journals published in English have higher impact factor scores in the JCR databases of the ISI than in Spanish citation indexes.

Resumen: Las prepublicaciones, borradores de trabajos distribuidos antes de su publicacion fonnal en revistas, han sido el proceso de comunicación científica que más se ha beneficiado de los avances en telecomunicaciones. Su distribución electrónica adopta diferentes modelos dependiendo de la disciplina a que se refieran. En el presente trabajo realizamos un estudio comparativo de su distribución en Economía (modelo descentralizado) y Física (modelo centralizado).Palabras clave: prepublicaciones, edición electrónica, comunicación científica.Abstract: Prepublications are accounts of research results that are distributed prior to fonnal publication in scientific journals. They are the fonn of seholarly communication that has taken more advantage of the advances in telecommunication and infonnation technologies. Their electronic distribution has taken a different form within the disciplines. In this paper we compare the decentralized model of Economics with the centralized model of Physics.