| article html file updated | 8 February 2020 06:21 CET | Update | https://www.mdpi.com/2218-1989/7/2/21 |
| article html file updated | 24 September 2019 22:32 CEST | Update | N/A |
| article html file updated | 3 May 2019 21:04 CEST | Update | N/A |
| article html file updated | 28 June 2017 13:51 CEST | Update | N/A |
| article html file updated | 22 May 2017 05:28 CEST | Original file | N/A |
| article xml uploaded. | 22 May 2017 05:27 CEST | Original file | https://www.mdpi.com/2218-1989/7/2/21/xml |
| article pdf uploaded. | 22 May 2017 05:27 CEST | Updated version of record | https://www.mdpi.com/2218-1989/7/2/21/pdf |
| article pdf uploaded. | 20 May 2017 14:25 CEST | Version of Record | https://www.mdpi.com/2218-1989/7/2/21/pdf-vor |
