- L Nikolova, “A note on the spectrum of a local symmetry group”, Reports on Mathematical Physics, 2, № 2, 1971, 99
- Etang Chen, “On the annihilator of energy-momentum spectra in quantum field theory”, Nuov Cim B, 2, № 2, 1971, 161
- R F Streater, “Outline of axiomatic relativistic quantum field theory”, Rep. Prog. Phys., 38, № 7, 1975, 771
- Norman E. Hurt, “Gauge invariant unified field structures, quantizable dynamical systems, charge, and spin structures”, Reports on Mathematical Physics, 4, № 2, 1973, 131
- A. Z. Jadczyk, “On some groups of automorphisms of von Neumann algebras with cyclic and separating vector”, Commun.Math. Phys., 13, № 2, 1969, 142
- Sergio Doplicher, Rudolf Haag, John E. Roberts, “Fields, observables and gauge transformations I”, Commun.Math. Phys., 13, № 1, 1969, 1