TY  - BOOK
AU  - Summer School on Mathematical Problems of Quantum Field Theory, Primorsko, Bulgaria, Sept. 1980
AU  - Doebner, H. D.
AU  - Palev, T. D.
TI  - Twister geometry and non-linear systems: ; review lectures given at the 4th Bulgarian summer school 
U1  - 530.1 
PY  - 1982///
CY  - Berlin
PB  - Springer-Verlag
ER  -