Mutzel, Petra Algorithms and Complexity, MPI for Informatics, Max Planck Society;
https://rdcu.be/dwph0 (Verlagsversion)
Jünger, M., Lee, E. K., Mutzel, P., & Odenthal, T. (1997). A Polyhedral Approach to the Multi-layer Crossing Minimization Problem. In G. Di Battista (Ed.), Graph Drawing (pp. 13-24). Berlin: Springer.