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% \MRhref is called by the amsart/book/proc definition of \MR.
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  \href{http://www.ams.org/mathscinet-getitem?mr=#1}{#2}
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\begin{thebibliography}{1}

\bibitem{CKS2026}
David O.~H. Cutler, Jonas Karlsson, and Neil J.~A. Sloane, \emph{Cutting a
  pancake with an exotic knife}, arXiv:2511.15864v4 [math.CO], 2026, 18 July
  2026.

\bibitem{MahajanChopra2026}
Siddhartha Mahajan and Paras Chopra, \emph{A two-graph refinement of
  {Paulsen}'s lollipop bounds}, arXiv:2606.06064v1 [math.CO], 2026, 4 June
  2026.

\bibitem{Mantel1907}
Willem Mantel, \emph{Problem 28}, Wiskundige Opgaven \textbf{10} (1907),
  60--61.

\bibitem{OEISA397182}
{OEIS Foundation Inc.}, \emph{{The On-Line Encyclopedia of Integer Sequences},
  {A397182}}, \url{https://oeis.org/A397182}, 2026, Accessed 23 July 2026.

\end{thebibliography}