DAWOOD, Narjis A.; 						GASIM, Suaad G..
 On Contractible J-Saces.
<strong>Ibn AL- Haitham Journal For Pure and Applied Sciences</strong>, [S.l.], p. 330-336, may 2018.
ISSN 2521-3407.
Available at: &lt;<a href="https://jih.uobaghdad.edu.iq/index.php/j/article/view/1867" target="_new">https://jih.uobaghdad.edu.iq/index.php/j/article/view/1867</a>&gt;. Date accessed: 15 aug. 2021.
doi: <a href="http://dx.doi.org/10.30526/2017.IHSCICONF.1867">http://dx.doi.org/10.30526/2017.IHSCICONF.1867</a>.