| article html file updated | 6 February 2020 07:08 CET | Update | https://www.mdpi.com/2077-1312/2/1/81 |
| article html file updated | 7 May 2019 18:53 CEST | Update | - |
| article html file updated | 21 March 2019 12:03 CET | Update | - |
| article html file updated | 19 August 2015 19:45 CEST | Update | - |
| article html file updated | 24 June 2014 12:13 CEST | Original file | - |
| article xml file uploaded | 24 June 2014 12:13 CEST | Original file | https://www.mdpi.com/2077-1312/2/1/81/xml |
| article pdf uploaded. | 7 February 2014 11:34 CET | Version of Record | https://www.mdpi.com/2077-1312/2/1/81/pdf |
