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PurposeThis paper aims to explore the literature on vertical farming to define key elements to outline a business model for entrepreneurs. The research aims to stimulate entrepreneurship for vertical farming in a smart cities' context, recognising urban agriculture as technology to satisfy increasing food needs.Design/methodology/approachThe research conducts a structured literature review on 186 articles on vertical farming extracted from the Scopus. Moreover, the bibliometric analysis revealed the descriptive statistics on this field and the main themes through the authors' keywords.FindingsDifferent perspectives showed the multidisciplinary nature of the topic and how the intersection of different skills is necessary to understand the subject entirely. The keywords analysis allowed for identifying the topics covered by the authors and the business model's elements.Research limitations/implicationsThe research explores a topic in the embryonic stage to define key strands of literature. It provides business model insights extending George and Bock's (2011) research to stimulate entrepreneurship in vertical farming. Limitations arise from the sources used to develop our analysis and how the topic appears as a frontier innovation.Originality/valueOriginality is the integration of literature strands related to vertical farming, highlighting its multidisciplinary nature to provide a holistic understanding of the themes. In smart cities' context, innovations allow traditional business models to be interpreted in a novel perspective and revealed the elements for transforming vertical farming from innovative technology to an effective source of food sustenance. Finally, the paper suggests a new methodology application for the analysis of word clusters by integrating correspondence analysis and multidimensional scaling analysis.

Purpose Waqf played a powerful Islamic social finance instrument throughout Islamic history. However, the popularity of waqf declined in recent years. It is essential to understand the past research, the research gaps and the waqf’s ignorant research areas within the existing literature to enhance the waqf system. Therefore, this study aims to carry a detailed analysis of waqf research development with a careful evaluation of the scientific panorama’s different aspects inherent in Islamic business and social finance. Design/methodology/approach Scientometrics is a discipline that studies the quantitative characteristics and characteristics of science and technological research, technology and innovation. This research’s string includes waqf as a reference in the “Article title, Abstract and Keywords” based on Scopus from 1990 to 2020. The analysis was conducted in December 2020. The Bibliometrix R Package, VOSviewer and Excel’s software are used to analyse the collected data and apply the bibliometric analysis. Findings The findings derive that waqf research can be categorized into three sub-areas, such as the research on waqf fundamentals, analysis on cash waqf and research on various waqf applications in Islamic social finance. Even though there is some essential or fundamental research in waqf, these are not good enough for such a powerful Islamic social finance instrument. This study finds research gaps in the existing waqf literature and presents nine future research directions. Originality/value To the best of the authors’ knowledge, this paper is the first to examine waqf’s existing literature with bibliometric analysis. The results and the recommended possible research areas can help scholars and researchers to carry future research to enhance the scientific development of Islamic social finance and provide alternative instruments to eradicate poverty in societies.

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