Table 1.
Summary of information about the sources and papers used for this study. Left column indicates the items summarized in this study.
| Time span (years) | 1991–2022 |
| Sources (journals and books) | 94 |
| Documents | 274 |
| Annual growth rate % | 5.95 |
| Document average age | 11.5 |
| Average citations per document | 29.86 |
| References | 5619 |
| DOCUMENT CONTENTS | |
| Keywords plus (ID) | 644 |
| Author’s keywords (DE) | 564 |
| Authors | 1019 |
| Authors of single-authored docs | 7 |
| Single-authored documents | 12 |
| Co-authors per document | 7 |
| International co-authorships | 48.91% |
| DOCUMENT TYPES | |
| Article | 228 |
| Article; book chapter | 4 |
| Article; early access | 1 |
| Article; proceedings paper | 14 |
| Editorial material | 1 |
| Letter | 1 |
| Meeting abstract | 3 |
| Proceedings paper | 2 |
| Review | 20 |