@article{2808, author = {Lavallee, Lorraine D.}, title = {Circle spaces}, journal = {Portugaliae mathematica}, volume = {36}, year = {1977}, pages = {17-24}, zbl = {0411.54002}, mrnumber = {0535219}, language = {en}, url = {http://dml.mathdoc.fr/item/2808} }
Lavallee, Lorraine D. Circle spaces. Portugaliae mathematica, Tome 36 (1977) pp. 17-24. http://gdmltest.u-ga.fr/item/2808/