\documentclass[12pt]{article}

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    @article{einstein,
        author = {Albert Einstein},
        title = {the true about tree},
        journaltitle = {Annalen der Physik},
        year = {1905},
        volume = {322},
        number = {10},
        pages = {891--921}
    }
\end{filecontents}

\addbibresource{bib.bib}

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\cite{einstein}

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