@inproceedings{Sushch:2016As, author = "Sushch, Iurii", title = "{Probing cluster environments of blazars through gamma-gamma absorption }", doi = "10.22323/1.236.0911", booktitle = "Proceedings of The 34th International Cosmic Ray Conference {\textemdash} PoS(ICRC2015)", year = 2016, volume = "236", pages = "911" }