SAADI, S.; CHAKER, A. A Numerical Simulation Approach for Sunspot Area Calculation. Engineering, Technology & Applied Science Research, Greece, v. 8, n. 3, p. 3013–3017, 2018. DOI: 10.48084/etasr.2038. Disponível em: https://etasr.com/index.php/ETASR/article/view/2038. Acesso em: 19 jan. 2022.