@article{JRAM_1992__425_153395,
     author = {R. Sch\"afke and H. Volkmer},
     title = {Asymptotic analysis of the equichordal problem.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {9--60},
     publisher = {mathdoc},
     volume = {425},
     year = {1992},
     zbl = {0781.53005},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1992__425_153395/}
}