Randeep Bhatia Sudipto Guha Samir Khuller Yoram J. Sussmann Facility Location with Dynamic Distance Function (Extended Abstract). 23-34 http://link.springer.de/link/service/series/0558/bibs/1432/14320023.htm 1998 conf/swat/1998 SWAT db/conf/swat/swat98.html#BhatiaGKS98