| article html file updated | 7 February 2020 18:54 CET | Update | https://www.mdpi.com/2313-0105/2/4/37 |
| article html file updated | 4 May 2019 20:44 CEST | Update | N/A |
| article html file updated | 2 December 2016 00:26 CET | Original file | N/A |
| article xml uploaded. | 1 December 2016 04:01 CET | Original file | https://www.mdpi.com/2313-0105/2/4/37/xml |
| article pdf uploaded. | 1 December 2016 04:01 CET | Version of Record | https://www.mdpi.com/2313-0105/2/4/37/pdf |
