@article{AM2_1978__17_136753,
     author = {J.S. Hwang and Paul Erd\"os},
     title = {On a geometric property of {Lemniscates.}},
     journal = {Aequationes mathematicae},
     pages = {344--347},
     publisher = {mathdoc},
     volume = {17},
     year = {1978},
     zbl = {0383.30001},
     url = {http://geodesic.mathdoc.fr/item/AM2_1978__17_136753/}
}