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  <div class="csl-entry">SULTANA, M.; KHALID, M. FORMATION OF LOPSIDED AND BAR STRUCTURES IN NON-STATIONARY GRAVITATING SYSTEMS. I- ISOTROPIC CASE. <b>The Nucleus</b>, <i>[S. l.]</i>, v. 50, n. 3, p. 285–288, 2013. DOI: 10.71330/thenucleus.2013.757. Disponível em: http://www.thenucleuspak.org.pk/index.php/Nucleus/article/view/757. Acesso em: 6 jun. 2026.</div>
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