21065 Chiara Boiti/Reinhold Meise: Evolution for overdetermined systems
in (small) Gevrey classes. Rend. Sem. Mat. Univ. Torino ... (ca. 2006), 14p.

23623 Louis Boutet de Monvel/Paul Kree: Pseudo-differential operators and Gevrey classes.
Ann. Inst. Fourier 17/1 (1967), 295-323.