Fernández-Rañada, Antonio2023-06-202023-06-2020010065-238510.1002/0471231495.ch2https://hdl.handle.net/20.500.14352/58973© 2001 John Wiley & Sons, Inc.journal articlehttp://dx.doi.org/10.1002/0471231495.ch2http://onlinelibrary.wiley.commetadata only access537Quantum-Field TheoryHopf IndexSolitonsForceKnotEquationsHelicityLines.ElectricidadElectrónica (Física)2202.03 Electricidad