Description of all conserved topological currents which depend on the fields and their first space-time derivatives Halfar, P. 1977 - DESY EPflicht - frei zugänglich
"n-soliton" solutions of the classical two dimensional Minkowskian O(3) nonlinear [sigma]-model Halfar, P. 1977 - DESY EPflicht - frei zugänglich
Solitons in classical O 3 -invariant field theory in one space dimension Halfar, P. 1976 - DESY EPflicht - frei zugänglich