Group theoretical methods in physics : Proceedings of the XVI int. colloquium held at Varna, Bulgaria, June 15-20, 1987 - Group theoretical methods in physics, international colloquium Varna) 1987; Doebner, Heinz D.; Hennig, Joerg D.; Palev, Theodor D. (Berlin : Springer-Verlag, 1988)
Keywords: quantum field theory