Avtar Singh GILL. Message from the SUN on 28th August 1859. Research Trends and Challenges in Physical Science Vol. 1, [S. l.], p. 62–82, 2021. DOI: 10.9734/bpi/rtcps/v1/12511D. Disponível em: https://stm.bookpi.org/RTCPS-V1/article/view/3611. Acesso em: 4 jun. 2026.