(DOI: http://dx.doi.org/10.5880/WSM.2018.002)
(DOI: http://dx.doi.org/10.5880/WSM.2016.001)
(DOI: http://dx.doi.org/10.5880/WSM.2016.002)
(DOI: http://dx.doi.org/10.5880/WSM.Germany2016)
(DOI: http://dx.doi.org/10.5880/WSM.Germany2016_en)
(DOI: http://dx.doi.org/10.5880/WSM.Europe2016)
(DOI: http://dx.doi.org/10.5880/WSM.Iceland2016)