@article{05191880, title = {Extremal properties of logarithmic spirals.}, journal = {Beitr\"age zur Algebra und Geometrie}, volume = {48}, year = {2007}, pages = {493-520}, zbl = {1159.53002}, language = {en}, url = {http://dml.mathdoc.fr/item/05191880} }
Bolt, Michael. Extremal properties of logarithmic spirals.. Beiträge zur Algebra und Geometrie, Tome 48 (2007) pp. 493-520. http://gdmltest.u-ga.fr/item/05191880/