| article html file updated | 8 February 2020 06:44 CET | Update | https://www.mdpi.com/2223-7747/6/2/21 |
| article html file updated | 25 September 2019 00:34 CEST | Update | N/A |
| article html file updated | 3 May 2019 20:20 CEST | Update | N/A |
| article html file updated | 29 June 2017 12:47 CEST | Update | N/A |
| article html file updated | 25 May 2017 14:59 CEST | Original file | N/A |
| article xml uploaded. | 25 May 2017 14:58 CEST | Original file | https://www.mdpi.com/2223-7747/6/2/21/xml |
| article pdf uploaded. | 25 May 2017 14:58 CEST | Version of Record | https://www.mdpi.com/2223-7747/6/2/21/pdf |
