| article html file updated | 8 February 2020 08:27 CET | Update | https://www.mdpi.com/2073-431X/6/2/21 |
| article html file updated | 25 September 2019 09:17 CEST | Update | N/A |
| article html file updated | 3 May 2019 17:10 CEST | Update | N/A |
| article html file updated | 28 June 2017 12:59 CEST | Update | N/A |
| article html file updated | 16 June 2017 10:34 CEST | Original file | N/A |
| article xml uploaded. | 16 June 2017 10:33 CEST | Original file | https://www.mdpi.com/2073-431X/6/2/21/xml |
| article pdf uploaded. | 16 June 2017 10:33 CEST | Version of Record | https://www.mdpi.com/2073-431X/6/2/21/pdf |
