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| Research method | Number of publications | 2001–2005 | 2006–2010 | 2011–2015 | 2016–2020 | 2021—present |
|---|---|---|---|---|---|---|
| Mathematical model / Algorithm | 84 | 2 2 | 24 | 14 | 21 | 23 |
| Conceptual / Theoretical | 7 | 2 | 2 | 2 | 1 | |
| Experimental test | 2 | 2 | ||||
| Interview | 1 | 1 | ||||
| Total | 94 | 4 | 24 | 16 | 23 | 27 |
