Esther M. Arkin Refael Hassin Shlomi Rubinstein Maxim Sviridenko Approximations for Maximum Transportation Problem with Permutable Supply Vector and Other Capacitated Star Packing Problems. 280-287 2002 conf/swat/2002 SWAT http://link.springer.de/link/service/series/0558/bibs/2368/23680280.htm db/conf/swat/swat2002.html#ArkinHRS02