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

2
by Matiaske, Wenzel
Published 2017
Nomos Verlagsgesellschaft mbH & Co. KG

3
by Lytras, Miltiadis
Published 2019
MDPI - Multidisciplinary Digital Publishing Institute

4
by Cai, Yuzhuo
Published 2020
MDPI - Multidisciplinary Digital Publishing Institute