| article html file updated | 7 February 2020 04:10 CET | Update | https://www.mdpi.com/2075-4701/6/2/31 |
| article html file updated | 6 May 2019 01:11 CEST | Update | N/A |
| article html file updated | 26 March 2019 19:54 CET | Original file | N/A |
| article pdf uploaded. | 2 February 2016 08:32 CET | Version of Record | https://www.mdpi.com/2075-4701/6/2/31/pdf |
| article xml uploaded. | 2 February 2016 08:32 CET | Original file | https://www.mdpi.com/2075-4701/6/2/31/xml |
