@collection{HolKutTru_j2016, editor = {Markus~Holzer and Martin~Kutrib and Bianca~Truthe}, title = {{Special Issues Dedicated to Rudolf Freund}}, series = jalc, volume = {21 (1--2)}, year = 2016, key = {Holzer Kutrib Truthe}, url = {http://jalc.de/issues/2016/issue_21_1-2/content.html} }