@article{DCG_1994__12_1_131322,
     author = {M. Sharir and B. Aronov},
     title = {Castles in the {Air} {Revisited.}},
     journal = {Discrete & computational geometry},
     pages = {119--150},
     year = {1994},
     volume = {12},
     number = {1},
     zbl = {0805.52005},
     url = {http://geodesic.mathdoc.fr/item/DCG_1994__12_1_131322/}
}