1. Andreotti, A., Nacinovic, M.: Analytic convexity and the principle of Phragmen — Lindelöf, Scuola Norm. Sup. Pisa 1980
2. Beurling, A.: Quasianalyticity and general distributions, Lectures 4 and 5, AMS Summer Institute, Stanford 1961
3. Björck, G.: Linear partial differential operators and generalized distributions, Ark. Mat. 6, 351–407(1965)
4. Braun, R.W.: An extension of Komatsu’s second structure theorem for ultradistributions, J. Fac. Sci. Tokyo Sec. IA 40, 411–417(1993)
5. Braun, R.W.: Surjektivität partieller Differentialoperatoren auf Roumieu — Klassen, Habilitationsschrift, Düsseldorf 1993