I have written an equation in LaTeX and I need to cite the author name with date (Einstein 1915) on the right side of my equation, I tried with the margin note command but it gets split in two lines, how do I get it in one line just right-below my equation?

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    Please edit you post and show us an minimal example of what you have tried. In the current form, we will have to guess around. – LaRiFaRi Aug 4 '14 at 10:54

Use the \tag command from the mathtools package (useless to load amsmath in that case). If you don't want the parentheses, use \ tag*:




    E = mc^{2}\tag{Einstein 1915}\\
    E = mc^{2}\tag*{Einstein 1915}


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