See This link for some clarifications about [henz98Scheduling].
[acc-revisited]
Scheduling a Major College Basketball Conference—Revisited
Operations Research 49(1), 163–168,
2001
[Henz99constraint-basedround]
Constraint-based Round Robin Tournament Planning
Proceedings of the International Conference on Logic Programming, 545–557,
1999
[Walser98Thesis]
Domain-Independent Local Search for Linear Integer Optimization
Ph.D. thesis, {Universität des Saarlandes, Fachbereich Informatik}
oct
1998
[henz98Scheduling]
Scheduling a Major College Basketball Conference
1998