Jungbluth, T., Kienle, U., Manos, B. 2015
Hinkov, G., Kachova, V.G., Mosquera-Losada, R., Popov, E., Trichkov, L. 2016
Boseley, S. 2018
Ramos, A. K. 2018
European Commission 2019
2023
Scottish Government 2024