1. Araki, H.: von Neumann algebras of local observables for free scalar field. J. Math. Phys. 5, 1–13 (1964).
https://doi.org/10.1063/1.1704063
2. Araki, H.: Mathematical Theory of Quantum Fields. International Series of Monographs on Physics, vol. 101. Oxford University Press, New York (1999)
3. Abramowitz, M., Stegun, I.A.: Handbook of Mathematical Functions with Formulas, Graphs, and Mathematical Tables. National Bureau of Standards Applied Mathematics Series, vol. 55. U.S. Government Printing Office, Washington, DC (1964)
4. Buchholz, D., D’Antoni, C., Fredenhagen, K.: The universal structure of local algebras. Commun. Math. Phys. 111(1), 123–135 (1987).
http://projecteuclid.org/euclid.cmp/1104159470
5. Buchholz, D., D’Antoni, C., Longo, R.: Nuclear maps and modular structures. I. General properties. J. Funct. Anal. 88(2), 233–250 (1990).
https://doi.org/10.1016/0022-1236(90)90104-S