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We extend to several variables an earlier result of ours, according to whichan entire function of one variable of sufficiently small exponential type,having all derivatives of even order taking integer values at two points, is apolynomial. The proof in the one dimensional case relies on Lidstone expansionof the function. For $n$ variables, we need $n+1$ points, having the propertythat the differences of $n$ of them with the remaining one give a basis of${{\mathbb C}}^n$. The proof is by reduction to the one variable situation.

On entire functions of several variables with derivatives of even order taking integer values