@inproceedings{Hillwig:2007pT, author = "Hillwig, Todd and Gies, Doug", title = "{Spectroscopic Observations of the Mass Donor Star in SS 433 }", doi = "10.22323/1.033.0077", booktitle = "Proceedings of VI Microquasar Workshop: Microquasars and Beyond {\textemdash} PoS(MQW6)", year = 2007, volume = "033", pages = "077" }