Doctoral theses are an important source of publication in universities, although little research has been carried out on the publications resulting from theses, on so-called derivative articles. This study investigates how derivative articles can be identified through a text analysis based on the full-text of a set of medical theses and the full-text of articles, with which they shared authorship. The text similarity analysis methodology applied consisted in exploiting the full-text articles according to organization of scientific discourse IMRaD (Introduction, Methodology, Results and Discussion) using the TurnItIn plagiarism tool. The study found that the text similarity rate in the Discussion section can be used to discriminate derivative articles from non-derivative articles. Additional findings were: the first position of the thesis's author dominated in 85 % of derivative articles, the participation of supervisors as coauthors occurred in 100 % of derivative articles, the authorship credit retained by the thesis's author was 42 % in derivative articles, the number of coauthors by article was 5 in derivative articles versus 6.4 coauthors, as average, in nonderivative articles and the time differential regarding the year of thesis completion showed that 87.5 % of derivative articles were published before or in the same year of thesis completion.

Purpose -To examine some of the ways in which electronic resources have made an impact on traditional interlending practices and how some userpractices have begun to change. Design/methodology/approach -This study uses both quantitative and qualitative data. The qualitative data were gathered through a questionnaire about the impact of electronic resources and the use of ILL. Comparisons of change were made with document suppliers. Findings -The electronic full-text is as yet unable to fully meet the needs of the researchers. Until full-text can approximate what is available in print both in journals and in monographs, the need for document delivery services will remain. Originality/value -An insight into the state of e-journal penetration and its impact on document delivery in Spain -a country where few studies have been carried out in this area.

This article analyses the difference in timing between the online availability of articles and their corresponding print publication and how it affects two bibliometric indicators: Journal Impact Factor (JIF) and Immediacy Index. This research examined 18,526 articles, the complete collection of articles and reviews published by a set of 61 journals on Urology and Nephrology in 2013 and 2014. The findings suggest that Advance Online Publication (AOP) accelerates the citation of articles and affects the JIF and Immediacy Index values. Regarding the JIF values, the comparison between journals with or without AOP showed statistically significant differences (P=0.001, Mann-Whitney U test). The Spearman's correlation between the JIF and the median online-to-print publication delay was not statistically significant. As to the Immediacy Index, a significant Spearman's correlation (rs=0.280, P=0.029) was found regarding the median online-to-print publication delays for journals published in 2014, although no statistically significant correlation was found for those published in 2013. Most journals examined (n=52 out of 61) published their articles in AOP. The analysis also showed different publisher practices: eight journals did not include the online posting dates in the full-text and nine journals published articles showing two different online posting dates--the date provided on the journal website and another provided by Elsevier's Science Direct. These practices suggest the need for transparency and standardization of the AOP dates of scientific articles for calculating bibliometric indicators for journals.Keywords: Advance online publication; immediacy index; journal impact factor; online posting date; publication delays, urology and nephrology journals. Influencia de la fecha de publicación online de los artículos científicos en los indicadores bibliométricosResumen: Este artículo analiza la distancia temporal entre la disponibilidad online de los artículos y su publicación en papel y cómo este lapso de tiempo afecta a los indicadores bibliométricos Factor de Impacto (JIF) e Índice de Inmediatez. Esta investigación examinó 18.526 artículos, la colección completa de artículos y revisiones publicadas por un conjunto de 61 revistas de Urología y Nefrología en 2013 y 2014. Los resultados hallados sugieren que la Publicación Electrónica Anticipada (AOP) acelera la citación de artículos, afectando a los valores de JIF e Índice de Inmediatez. Respecto a los valores de JIF, la comparación entre revistas con AOP y sin esta característica mostró diferencias estadísticamente significativas (P=0,001, U test Mann-Whitney). La correlación de Spearman entre JIF y la mediana del intervalo de tiempo publicación online-papel no resultó ser estadísticamente significativa. En cuanto al Índice de Inmediatez, se halló una correlación de Spearman significativa respecto a la mediana del intervalo de publicación online-papel (rs=0,280, P=0,029) para las revistas publicadas en 2014, pero sin correlación significativa para las pu...

Purpose -The paper's aim is to provide insights into interlending and document supply (ILDS) practices in Spain in the current environment of library consortia and to present recent trends in academic ILDS services.