  We extend to several variables an earlier result of ours, according to which
an entire function of one variable of sufficiently small exponential type,
having all derivatives of even order taking integer values at two points, is a
polynomial. The proof in the one dimensional case relies on Lidstone expansion
of the function. For $n$ variables, we need $n+1$ points, having the property
that 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.
