供参考
bibliographystyle{amsplain}
begin{thebibliography}{10}
bibitem{ElementaryNumberTheory}S.Ramanujan. (1919). A proof of Bertrand's Postulate. Journal of the Indian Mathematical Society, 111,181-182.
bibitem{ElementaryNumberTheory} T.M. Apostol. textit{Introduction to Analytic Number}. Undergraduate Texts in Mathematics. Springer, 1998. xii+338 pp.
end{thebibliography}

例如 [\lfloor\frac{3n}{2}, 4n\rfloor] 运行出错