| article html file updated | 7 February 2020 04:44 CET | Update | https://www.mdpi.com/2313-576X/2/1/4 |
| article html file updated | 5 May 2019 23:55 CEST | Update | - |
| article html file updated | 26 March 2019 21:06 CET | Original file | - |
| article pdf uploaded. | 19 February 2016 08:46 CET | Version of Record | https://www.mdpi.com/2313-576X/2/1/4/pdf |
| article xml uploaded. | 19 February 2016 08:46 CET | Original file | https://www.mdpi.com/2313-576X/2/1/4/xml |
