| article html file updated | 8 February 2020 02:56 CET | Update | https://www.mdpi.com/2220-9964/6/4/109 |
| article html file updated | 24 September 2019 04:10 CEST | Update | N/A |
| article html file updated | 4 May 2019 03:31 CEST | Update | N/A |
| article html file updated | 28 April 2017 08:16 CEST | Update | N/A |
| article html file updated | 6 April 2017 12:46 CEST | Original file | N/A |
| article xml uploaded. | 6 April 2017 12:45 CEST | Original file | https://www.mdpi.com/2220-9964/6/4/109/xml |
| article pdf uploaded. | 6 April 2017 12:45 CEST | Updated version of record | https://www.mdpi.com/2220-9964/6/4/109/pdf |
| article pdf uploaded. | 5 April 2017 15:42 CEST | Version of Record | https://www.mdpi.com/2220-9964/6/4/109/pdf-vor |
