A. Wolff, M. Thon, and Y. Xu. Proc. 11th Annu. Int. Symp. Algorithms Comput.
(ISAAC'00), volume 1969 of Lecture Notes in Computer Science, page 422--431. Springer-Verlag, (2000)
A. Wolff. Lectures on Proof Verification and Approximation Algorithms, volume 1367 of Lecture Notes in Computer Science Tutorial, chapter 10, Springer-Verlag, (1998)
J. Walter, J. Zink, J. Baumeister, and A. Wolff. Proc. 28th Int. Symp. Graph Drawing & Network
Vis. (GD'20), volume 12590 of Lecture Notes in Computer Science, page 220--234. Springer-Verlag, (2021)
F. Wagner, and A. Wolff. Proc. 6th Int. Sympos. Graph Drawing (GD'98), volume 1547 of Lecture Notes in Computer Science, page 316--331. Springer-Verlag, (1999)