@article{bs-rsddcp-01<br>, author = {Sergei Bespamyatnikh and Michael Segal}<br>, title = {Rectilinear Static and Dynamic Discrete 2-center Problems}<br>, journal = {Int. Journal of Math. Algorithms}<br>, year = {2001}<br>, volume = {2}<br>, pages = {149--162}<br>}<br><br>