# Overview of Blockchain Oracle Research
## 4 Results
### Contribution by Author/Institution and Metric
\begin{table}
\begin{tabular}{c c c c} \hline \hline \# & **Name** & **Institution** & **Documents** & **Citations** \\ \hline
1 & [PERSON] & UNSW, CSIRO-DATA61 & 6 & 908 \\
2 & [PERSON] & University of Toronto & 2 & 133 \\
3 & [PERSON] & UNSW, CSIRO-DATA61 & 2 & 116 \\
4 & [PERSON] & University of Ljubljana & 2 & 115 \\
5 & [PERSON] & University of Verona & 5 & 109 \\
6 & [PERSON] & Khalifa University & 2 & 107 \\
7 & [PERSON] & Khalifa University & 2 & 97 \\
8 & [PERSON] & Fujian Agriculture and Forest University & 2 & 54 \\
9 & [PERSON] & University of Insubria & 3 & 50 \\
10 & [PERSON] & University of Insubria & 3 & 50 \\
11 & [PERSON], [PERSON] & Khalifa University & 3 & 50 \\
12 & [PERSON], [PERSON] & Khalifa University & 3 & 49 \\
13 & [PERSON] & INRS Montreal & 2 & 44 \\
14 & [PERSON] & Sherbrook University & 3 & 34 \\
15 & [PERSON] & CEA-LIST & 2 & 30 \\
16 & [PERSON] & Sapienza University of Rome & 3 & 29 \\
17 & [PERSON] & University of Malta & 3 & 29 \\
18 & [PERSON] & University of Toronto & 2 & 26 \\
19 & [PERSON] & National Chi Nan University & 2 & 18 \\
20 & [PERSON] & University of Cagliari & 2 & 17 \\ \hline \hline \end{tabular}
\end{table} 
Table 10: Twenty most-cited authors. \begin{table}
\begin{tabular}{c c c c} \hline \hline \# & **Institution** & **Number** & **OT** & **OA** \\ \hline
1 & Khalifa University & 13 & 1 & 12 \\
2 & University of Verona & 8 & 5 & 3 \\
3 & UNSW, CSIRO-DATA61 & 6 & 5 & 1 \\
4 & University of Toronto & 5 & 5 & 0 \\
5 & Beijing University & 4 & 2 & 2 \\
6 & Technische Universität Berlin & 3 & 1 & 2 \\
7 & University of Insubria & 3 & 0 & 3 \\
8 & University of Ljubljana & 3 & 1 & 2 \\
9 & University of Potsdam & 3 & 0 & 3 \\
10 & INRS Montreal & 3 & 1 & 2 \\ \hline \hline \end{tabular}
\end{table} 
Table 11: Most productive institutions. cited and 4 were among the first twenty. Observing the coauthorship, apart from the four most cited first authors, many other authors from the same university also participated in the research studies. Among them, [PERSON] and [PERSON] are the most cited, with 144 citations each. These findings provide an idea of institutions that are heavily investing in this sector. Furthermore, this institution contributed at least one paper to every oracle application category (except for business process management (BPM) and energy). Furthermore, in addition to offering contributions to the healthcare and data management fields, they also produced research to address the oracle problem. Moreover, the University of Verona is also focused on addressing the oracle problem, which is ranked second by the number of articles produced. However, publications from this institution are relatively recent and are not among the top-cited publications. From the same country (Italy), the University of Insubria is also among the most productive institutions, and two authors, [PERSON] and [PERSON], are among the most cited (50 citations each). Studies from this university and its researchers were mainly concerned with OA as an IoT in business processes. Another notable institution is the University of Ljubljana, from which its contributions focus on cloud/fog computing and the oracle problem. The institution also belongs to the fifth most cited paper [66] and the fourth most contributing author, [PERSON], with 115 citations. Among the most productive institutions, five other institutions emerged, for which their researchers were also among the most impactful ones. These institutions include Beijing University, Technische Universitat Berlin, the University of Potsdam, and the Institut national de la recherche scientifique (INRS) of Montreal. [PERSON], [PERSON], from INRS of Montreal, is the most cited in this group (44 citations), and his main contributions focused on OT. Finally, from Technische Universitat Berlin is [PERSON], which, although not the first author of any of the papers in the sample, has coauthored some of the most cited ones (303 total citations).