Imran, M., M. Ikram, R. U. Islam, M. Anwar, H. Tariq, and M. Ahmad. “Development Operation and Characterization of Cesium Beam Atomic Clock”. The Nucleus 57, no. 2 (October 28, 2020): 49–55. Accessed May 2, 2024. http://www.thenucleuspak.org.pk/index.php/Nucleus/article/view/526.