Editorial Special Issue on the Occasion of Prof. Dr. Alf Pühlers 75th birthday.

Paula Marques Alves, Anke Becker, Helmut Blöcker, Raquel Lia Chan, George Guo-Qiang Chen, Martin Fussenegger, Akihiko Kondo, Robert Kourist, Helmut Schwab, Christoph Wilhelm Sensen, Maria Sensen, Jin-Ho Seo, Friedrich Srienc