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@article{DCG_1989__4_6_131077, author = {R. Hayward}, title = {A {Note} on the {Circle} {Containment} {Problem.}}, journal = {Discrete & computational geometry}, pages = {263--264}, publisher = {mathdoc}, volume = {4}, number = {6}, year = {1989}, zbl = {0673.52008}, url = {http://geodesic.mathdoc.fr/item/DCG_1989__4_6_131077/} }
R. Hayward. A Note on the Circle Containment Problem.. Discrete & computational geometry, Tome 4 (1989) no. 6, pp. 263-264. http://geodesic.mathdoc.fr/item/DCG_1989__4_6_131077/