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Is there any link, info or documentation how should be every entry in the \bibitem mentioned? For example

\bibitem{Misiak} A. Misiak. \ \textit{$n$-inner product spaces.} Math.Nachr. {\bf 140} (1989), 299--319.

\bibitem{WKG} R.A. Wibawa-Kusumah and H. Gunawan. \textit{Two equivalent $n$-norms ...