@article{Petukhova:2017ge, author = "Petukhova, Anastasia and Petukhov, Ivan and Petukhov, Stanislav", title = "{Toroidal Models of the Force-free Magnetic Field}", doi = "10.22323/1.301.0121", journal = "PoS", year = 2017, volume = "ICRC2017", pages = "121" }