Gregory Gutin Arash Rafiey Anders Yeo Minimum Cost Homomorphism Dichotomy for Oriented Cycles. 224-234 2008 AAIM http://dx.doi.org/10.1007/978-3-540-68880-8_22 conf/aaim/2008 db/conf/aaim/aaim2008.html#GutinRY08