@misc{BergerHoehle2019, author = {Frauke Berger and Barbara H{\"o}hle}, title = {Restrictions on addition}, booktitle = {Postprints der Universit{\"a}t Potsdam Humanwissenschaftliche Reihe}, number = {509}, issn = {1866-8364}, doi = {10.25932/publishup-41491}, institution = {Humanwissenschaftliche Fakult{\"a}t}, series = {Zweitver{\"o}ffentlichungen der Universit{\"a}t Potsdam : Humanwissenschaftliche Reihe}, number = {509}, type = {postprint}, pages = {28}, year = {2019}, }