@inproceedings{Reimer:2011b4, author = "Reimer, Anita", title = "{Constraints on the gamma-ray opacity of the Universe with the Fermi-LAT instrument}", doi = "10.22323/1.123.0111", booktitle = "Proceedings of 25th Texas Symposium on Relativistic Astrophysics {\textemdash} PoS(Texas 2010)", year = 2011, volume = "123", pages = "111" }