Table 2. Selected keywords.
| Focus category | |||
|---|---|---|---|
| 1 | 2 | 3 | 4 | 
| Digital taxation | Frugal innovation | Frugal innovation, | Frugal innovation, digital taxation | 
| Digital Taxation | University | ||
| Digital services | Frugal innovation | Digital services | Digital services | 
| Tax or digital taxation | or | Tax or digital Taxation | Tax or digital taxation | 
| frugal innovations | and frugal innovation | and frugal innovation in university | |