PURWANTO, M. S.; SUSILO, A.; NABA, A.; BAHRI, A. S.; NAVISA, S. Integration of Principal Component Analysis and Very Low Frequency Geophysical Method for Modeling Recharge Area Distribution: The Case Study of Krawak Spring, Tuban. Engineering, Technology & Applied Science Research, Greece, v. 15, n. 3, p. 22644–22662, 2025. DOI: 10.48084/etasr.10508. Disponível em: https://mail.etasr.com/index.php/ETASR/article/view/10508. Acesso em: 22 may. 2026.