Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{ELMA_1968__23_140886, author = {J. Spilker and M.W. Richter}, title = {Area of the {Union} of {Disks.}}, journal = {Elemente der Mathematik}, pages = {60--63}, publisher = {mathdoc}, volume = {23}, year = {1968}, url = {http://geodesic.mathdoc.fr/item/ELMA_1968__23_140886/} }
J. Spilker; M.W. Richter. Area of the Union of Disks.. Elemente der Mathematik, Tome 23 (1968), pp. 60-63. http://geodesic.mathdoc.fr/item/ELMA_1968__23_140886/