| article html file updated | 8 February 2020 02:38 CET | Update | https://www.mdpi.com/2218-1997/3/2/33 |
| article html file updated | 24 September 2019 02:24 CEST | Update | N/A |
| article html file updated | 4 May 2019 04:13 CEST | Update | N/A |
| article html file updated | 30 June 2017 09:15 CEST | Update | N/A |
| article html file updated | 31 March 2017 12:04 CEST | Original file | N/A |
| article xml uploaded. | 31 March 2017 12:02 CEST | Original file | https://www.mdpi.com/2218-1997/3/2/33/xml |
| article pdf uploaded. | 31 March 2017 12:02 CEST | Version of Record | https://www.mdpi.com/2218-1997/3/2/33/pdf |
