@article{cd6e3148eb66404bbd61181f0a8513b4,
title = "Hopf term for a two-dimensional electron gas",
keywords = "quantum Hall effect, Skyrmion, topological Hopf term, quantum Hall effect, Skyrmion, topological Hopf term, quantum Hall effect, Skyrmion, topological Hopf term",
author = "G.E. Volovik and V.M. Yakovenko",
year = "1997",
doi = "10.1103/PhysRevLett.79.3791",
language = "English",
volume = "79",
pages = "3791",
journal = "Physical Review Letters",
issn = "1079-7114",
publisher = "American Physical Society",
number = "19",
}