  For $h \ge 2$ and an infinite set of positive integers $A$, let $R_{A,h}(n)$
denote the number of solutions of the equation $a_{1} + a_{2} + \dots{} + a_{h}
= n, a_{1} \in A, \dots{} ,a_{h} \in A, a_{1} < a_{2} < \dots{} < a_{h}.$ In
this paper we prove the existence of a set $A$ formed by perfect powers with
almost possible maximal density such that $R_{A,h}(n)$ is bounded by using
probabilistic methods.
