6
by Tańczuk, Renata
Published 2018
Peter Lang International Academic Publishing Group

7
by Reichert, Herbert W.
Published 1949
The University of North Carolina Press

8
by Dierksmeier, Claus
Published 2019
Springer Nature

11
by Puhl, Monika
Published 2005
Fink

13
by O'Flaherty, James C.
Published 1952
The University of North Carolina Press

14
by Peter Iver Kaufman
Published 2013
MDPI - Multidisciplinary Digital Publishing Institute

16
by Skre, Dagfinn
Published 2020
De Gruyter

19
by Jacobs, Joela
Published 2020
MDPI - Multidisciplinary Digital Publishing Institute

20
by Metress, Christopher
Published 2020
MDPI - Multidisciplinary Digital Publishing Institute