LEE, In-Won; 						JUNG, Hyung-Jo; 						KIM, Man-Cheol.
 Efficient free vibration analysis of large structures with close or multiple natural frequencies. Part I: Undamped structures.
<strong>Computer Assisted Methods in Engineering and Science</strong>, [S.l.], v. 6, n. 3-4, p. 403-414, may 2023.
ISSN 2956-5839.
Available at: &lt;<a href="https://cames.ippt.pan.pl/index.php/cames/article/view/1299" target="_new">https://cames.ippt.pan.pl/index.php/cames/article/view/1299</a>&gt;. Date accessed: 22 july 2024.