Costa, G.Zimerman, A. H.2022-04-292022-04-291966-11-01Il Nuovo Cimento A Series 10, v. 46, n. 1, p. 198-200, 1966.0369-35461826-9869http://hdl.handle.net/11449/231166198-200engSum rules from asymptotic symmetry requirementsCarta10.1007/BF027387792-s2.0-51649188951