Mutzel, Petra Algorithms and Complexity, MPI for Informatics, Max Planck Society;
https://rdcu.be/dufpy (Publisher version)
Jünger, M., & Mutzel, P. (1996). Exact and heuristic algorithms for 2-layer straightline crossing minimization. In F. J. Brandenburg (Ed.), Graph Drawing (pp. 337-348). Berlin, Germany: Springer.