1. 1. Agliardi, R.: A division theorem in Gevrey classes. Rend. Sem. Mat. Univ. Pol. Torino 49, no. 3, 385-396 (1991)
2. 2. Boutet de Monvel, L.: Opérateurs pseudo-différentiels analytiques et opérateurs d'ordre infini. Ann. Inst. Fourier, Grenoble 22, 229-268 (1972)
3. 3. Boutet de Monvel, L., Krée, P.: Pseudodifferential operators and Gevrey classes. Ann. Inst. Fourier, Grenoble 17, 295-323 (1967)
4. 4. Cappiello, M.: Pseudodifferential parametrices of infinite order for SG-hyperbolic problems. Rend. Sem. Mat. Univ. Pol. Torino 61, no. 4, 1–31 (2003)
5. 5. Cappiello, M.: Fourier integral operators of infinite order and applications to SG-hyperbolic equations. Tsukuba J. Math. 28, no. 2, 311–361 (2004)