https://www.ibr.cs.tu-bs.de/alg/eurocg13/booklet_eurocg13.pdf (Any fulltext)
Das, A., Fleszar, K., Kobourov, S. G., Spoerhase, J., Veeramoni, S., & Wolff, A. (2013). Polylogarithmic Approximation for Generalized Minimum Manhattan Networks. In EuroCG 2013 (pp. 81-84).