| article html file updated | 8 February 2020 08:42 CET | Update | https://www.mdpi.com/2218-1997/3/2/50 |
| article html file updated | 3 May 2019 16:39 CEST | Update | N/A |
| article html file updated | 30 June 2017 09:16 CEST | Update | N/A |
| article html file updated | 20 June 2017 08:41 CEST | Update | N/A |
| article xml uploaded. | 20 June 2017 08:40 CEST | Update | https://www.mdpi.com/2218-1997/3/2/50/xml |
| article pdf uploaded. | 20 June 2017 08:40 CEST | Updated version of record | https://www.mdpi.com/2218-1997/3/2/50/pdf |
| article html file updated | 19 June 2017 14:32 CEST | Original file | N/A |
| article pdf uploaded. | 19 June 2017 14:31 CEST | Version of Record | https://www.mdpi.com/2218-1997/3/2/50/pdf-vor |
