
referenced not cited:
%  \bibitem{1} P. Erd\H{o}s, Problems and results in combinatorial number theory, \emph{Asterisque} \textbf{24-25} (1975), 295--310.
%  \bibitem{9} J. Wroblewski, A non-averaging set of integers with a large sum of reciprocals, \emph{Math. Comp.} \textbf{43} (1984), 261--262.

