references.html

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    <ol>
        <li id="1">Curtis, Howard D. <i>Orbital Mechanics for Engineering Students</i>. 2nd ed., Amsterdam, Butterworth-Heinemann, 2010.</li>
        <li id="2">Vallado, David A., and Wayne D. McClain. <i>Fundamentals of Astrodynamics and Applications</i>. 4th ed., Hawthorne, Microcosm Press, 2013.</li>
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    <ul>
    <li><a href="https://github.com/17isgreaterthan18/keplerian-elements-visual/">source code</a> :)</li>
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