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N.~Benjamin, K.~Langhoff, W.~Li and J.~Thaler,
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\bibitem{EL}
L.~Eberhardt and N.~Levine,
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\bibitem{Hellerman}
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\bibitem{FriedanKeller}
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\bibitem{CLY}
S.~Collier, Y.-H.~Lin and X.~Yin,
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\bibitem{HMR}
T.~Hartman, D.~Maz\'a\v{c} and L.~Rastelli,
\emph{Sphere packing and quantum gravity},
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\bibitem{ACHT}
N.~Afkhami-Jeddi, H.~Cohn, T.~Hartman and A.~Tajdini,
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\bibitem{Cohen}
P.~J.~Cohen,
\emph{On a conjecture of Littlewood and idempotent measures},
Amer. J. Math. \textbf{82} (1960), 191--212.

\end{thebibliography}