@inproceedings{bk-rcp-99
, author = {Sergei Bespamyatnikh and David Kirkpatrick}
, title = {Rectilinear 2-center Problems}
, booktitle = {Proc. 11th Canad. Conf. Comput. Geom.}
, year = {1999}
, pages = {68--71}
}