| article xml uploaded. | 16 September 2021 09:48 CEST | Update | https://www.mdpi.com/2409-515X/3/1/2/xml |
| article html file updated | 24 February 2017 12:18 CET | Original file | https://www.mdpi.com/2409-515X/3/1/2 |
| article xml uploaded. | 24 February 2017 12:17 CET | Original file | N/A |
| article pdf uploaded. | 24 February 2017 12:17 CET | Version of Record | https://www.mdpi.com/2409-515X/3/1/2/pdf |
