1
by Rittmann, Günter
Published 2014
Nomos Verlagsgesellschaft mbH & Co. KG

2
by Lytras, Miltiadis
Published 2019
MDPI - Multidisciplinary Digital Publishing Institute

3
by Gritsenko, Daria
Published 2021
Springer Nature

4
by Gritsenko, Daria
Published 2021
Springer Nature