A sufficient condition for existence of real analytic solutions of P.D.E. with constant coefficients, in open sets of ℝ 2
Rendiconti del Seminario Matematico della Università di Padova, Tome 63 (1980), pp. 83-87. 
@article{RSMUP_1980__63__83_0,
     author = {Zampieri, Giuseppe},
     title = {A sufficient condition for existence of real analytic solutions of {P.D.E.} with constant coefficients, in open sets of $\mathbb {R}^2$},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     pages = {83--87},
     publisher = {Seminario Matematico of the University of Padua},
     volume = {63},
     year = {1980},
     mrnumber = {605785},
     zbl = {0499.35021},
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     url = {http://archive.numdam.org/item/RSMUP_1980__63__83_0/}
}
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Zampieri, Giuseppe. A sufficient condition for existence of real analytic solutions of P.D.E. with constant coefficients, in open sets of $\mathbb {R}^2$. Rendiconti del Seminario Matematico della Università di Padova, Tome 63 (1980), pp. 83-87. http://archive.numdam.org/item/RSMUP_1980__63__83_0/

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