Abstract. The aim of this paper is to estimate fuel demand behaviour related to car use by households with different income levels in Spain using micro-level panel data in order to infer public policy implications. Our results show that the income elasticity of fuel demand is highest for the lowest income group and diminishes monotonically for the others. The price elasticity is highest in absolute value for the lowest income group, lowest for the highest income quartile and similar for the medium-low and medium-high income groups.

Abstract. The European Climate and Energy mix of targets and policies has been criticised by many economists. In particular, it is often argued that the renewable energy targets do not make economic sense, because they represent an expensive option to reduce CO2 emissions within a cap-and-trade scheme such as the European Union Emissions Trading Scheme (EU ETS).

Abstract. The aim of this paper is to make manifest the intellectual and cognitive structure of nanoscience and nanotechnology (NST) by means of visualization techniques. To this end, we used data from the Web of Science (WoS), delimiting the data to the category NST during the period of 2000–2013, retrieving a total of 198,275 documents. Through direct author citation of these works, we identified their origins and the seminal papers, and through word co-occurrence extracted from the titles and abstracts, the main lines of research were identified.

Abstract
Purpose
Research with stem cells is a biomedical venture with great scientific impact, and whose development flows over into many other areas. This article aims to present a dual analysis of Spain's scientific output in this field during the period 1997‐2007.

Design/methodology/approach
The authors used bibliometric indicators of a basic nature as well as techniques for the visualization and analysis of networks of scientific information based on a study of KeyWords Plus.

Abstract. This paper presents and applies an experimental agroforestry accounting system (AAS) to measure the commercial income and capital of hunting activities in a large territorial area.

Abstract. This paper proposes a novel approach for simulating the price of hunting self-consumption by owners in the experimental Agroforestry Accounting System (AAS).

Abstract. We perform two convergent validity tests in a choice experiment applied to public recreation in Spanish stone pine and cork oak forests. Results show convergent validity between a choice and a ranking recoded as a choice format in an experiment with three alternatives plus status quo.

Abstract. Context. Driven hunts exemplify the most representative form of big-game hunting in southern Europe.
Aims. We analysed hunter preferences for driven hunts and the marginal willingness to pay for their characteristics.
Methods. We conducted a discrete-choice experiment for driven hunts, taking into account the number of deer that could
be hunted, the possibility of free-range wild-boar hunting, the presence of trophies, and other characteristics of driven hunts, such as congestion and travel time.

Abstract. This study on research collaboration (RC) is an attempt to estimate the degree of internationalization of academic institutions and regions. Furthermore potential influences of RC on excellence initiatives of modern universities are investigated relying on source data obtained from SCImago Institutions Rankings. A positive correlation exists between the degree of collaboration and the normalized impact. However, in contrast to output the normalized impact increase progression is non-linear and fluctuating.

Abstract. The SCImago Institutions Rankings (SIR) World Reports are published annually. These reports contain an international ranking of more than 2000 research institutions and organizations. The indicator values are based on publication and citation data from Scopus (Elsevier) for research-devoted institutions with at least 100 papers published within the year under study.