RT Journal Article T1 Ball lightning an electromagnetic knot? A1 Fernández-Rañada, Antonio PB Macmillan SN 0028-0836 YR 1996 FD 1996-09-05 LK https://hdl.handle.net/20.500.14352/58983 UL https://hdl.handle.net/20.500.14352/58983 LA eng NO © 1996 Nature Publishing Group. DS Docta Complutense RD 10 abr 2025