Alexander A. Ageev Refael Hassin Maxim Sviridenko An approximation algorithm for MAX DICUT with given sizes of parts. 34-41 http://link.springer.de/link/service/series/0558/bibs/1913/19130034.htm 2000 conf/approx/2000 APPROX db/conf/approx/approx2000.html#AgeevHS00