1. [Ar] D. H. Armitage,Cones on which entire harmonic functions can vanish, Proc. Roy. Irish Acad. Sect. A92 (1992), 107–110.
2. [Av] V. Avanissian,Cellule d'Harmonicité et Prolongement Analytique Complexe, Hermann, Paris, 1985.
3. [Ba] V. Bargmann,On a Hilbert space of analytic functions and an associated integral transform, Comm. Pure Appl. Math. (1961), 187–215.
4. [Bj] J.-E. Björk,Rings of Partial Differential Operators, North-Holland, Amsterdam, 1979.
5. [BC] M. Brelot and G. Choquet,Polynômes harmoniques et polyharmoniques, Colloque sur les équations aux dérivées partielles, Brussels, 1954, pp. 45–66.