@inproceedings{Swiezewski:20161R, author = "Swiezewski, Jedrzej", title = "{Observers diffeomorphism-invariant description of a general relativistic system}", doi = "10.22323/1.224.0176", booktitle = "Proceedings of Frontiers of Fundamental Physics 14 {\textemdash} PoS(FFP14)", year = 2016, volume = "224", pages = "176" }