| article html file updated | 8 February 2020 02:21 CET | Update | https://www.mdpi.com/2218-1997/3/2/31 |
| article html file updated | 24 September 2019 00:53 CEST | Update | N/A |
| article html file updated | 4 May 2019 04:47 CEST | Update | N/A |
| article html file updated | 30 June 2017 09:15 CEST | Update | N/A |
| article html file updated | 27 March 2017 14:53 CEST | Original file | N/A |
| article xml uploaded. | 27 March 2017 14:52 CEST | Original file | https://www.mdpi.com/2218-1997/3/2/31/xml |
| article pdf uploaded. | 27 March 2017 14:52 CEST | Version of Record | https://www.mdpi.com/2218-1997/3/2/31/pdf |
