@inproceedings{Zimmermann:2014ZD, author = "Zimmermann, Frank and OIDE, Katsunobu", title = "{The Circular Road to a Higgs Factory and Beyond}", doi = "10.22323/1.180.0554", booktitle = "Proceedings of The European Physical Society Conference on High Energy Physics {\textemdash} PoS(EPS-HEP 2013)", year = 2014, volume = "180", pages = "554" }