%0 Book %A Bulgarian Summer School on Mathematical Problems of Quantum Field Theory, Doebner, Heinz Dietrich, 1931-, Palev, Tchavdar D., %T Twistor geometry and non-linear systems : review lectures given at the 4th Bulgarian Summer School on Mathematical Problems of Quantum Field Theory, held at Primorsko, Bulgaria, September 1980 %D 1982 K1 Twistor theory--Congresses K1 Nonlinear theories--Congresses K1 Quantum field theory--Congresses %I Springer-Verlag %C Berlin ; New York %@ 9783540119722 [3540119728] (: Berlin) %@ 9780387119724 [0387119728] (: New York)