Database development
| Sample | Number of articles |
|---|---|
| 2,372 |
| −1,783 |
| −518 |
| −5 |
| 66 |
| +25 |
| Final sample | 91 |
| Sample | Number of articles |
|---|---|
(1)Keyword search (Scopus 2,171 + ISI 255–54 duplicates) | 2,372 |
(2)Contributions concerning other fields and/or book (chapters) | −1,783 |
(3)Contributions concerning private firms | −518 |
(4)Articles published in non-Scimago journals | −5 |
(5)Relevant articles | 66 |
(6)Articles added from an additional search | +25 |
| Final sample | 91 |