@article{GDZPPN002084279, title = {The Nonexistence of Certain Topological Polygons.}, journal = {Forum mathematicum}, volume = {2}, year = {1990}, pages = {603-612}, zbl = {0711.51002}, url = {http://dml.mathdoc.fr/item/GDZPPN002084279} }
Knarr, Norbert. The Nonexistence of Certain Topological Polygons.. Forum mathematicum, Tome 2 (1990) pp. 603-612. http://gdmltest.u-ga.fr/item/GDZPPN002084279/