| article html file updated | 8 February 2020 01:08 CET | Update | https://www.mdpi.com/2304-8158/6/3/21 |
| article html file updated | 23 September 2019 17:56 CEST | Update | N/A |
| article html file updated | 4 May 2019 07:27 CEST | Update | N/A |
| article html file updated | 28 March 2017 10:16 CEST | Update | N/A |
| article html file updated | 9 March 2017 17:06 CET | Original file | N/A |
| article xml uploaded. | 9 March 2017 17:05 CET | Original file | https://www.mdpi.com/2304-8158/6/3/21/xml |
| article pdf uploaded. | 9 March 2017 17:05 CET | Version of Record | https://www.mdpi.com/2304-8158/6/3/21/pdf |
