Hiranjyoti Mahanta Phalguni Gupta Sajal K. Das Approximate and On-line Algorithms for List Update Problem. 14-23 2002 conf/sccc/2002 SCCC http://csdl.computer.org/comp/proceedings/sccc/2002/1867/00/18670014abs.htm db/conf/sccc/sccc2002.html#MahantaGD02