Yasser A. Abdel-Hadi and A. H. Hassan. Variation of the Twilight Stages due to Sun Elevation: A Case Study in Malaysia. NTPSR-V4 [Internet]. 2022 May 19 [cited 2026 Jun. 13];:125-4. Available from: https://stm.bookpi.org/NTPSR-V4/article/view/6939