B. Hamid, A.
(2018).
 Geometrical Effects of Conic Sections on  The Motion of Bodies.
<em>Gezira Journal Of Engineering And Applied Sciences, 10</em>(2).
Retrieved from <a href="http://journals.uofg.edu.sd/index.php/gjeas/article/view/505" target="_new">http://journals.uofg.edu.sd/index.php/gjeas/article/view/505</a>