https://kadjalab.com/publication/149-moh-mualliful-ilmi-sofwan-noerwidi-rustan-lebe-adhi-a-oktaviana-basran-burhan-grandprix-t-m-kadja-ismunandar-physicochemical-analysis-of-deterioration-affecting-the-darkening-of-rock-ar/
149. Moh. Mualliful Ilmi, Sofwan Noerwidi, Rustan Lebe, Adhi A. Oktaviana, Basran Burhan, Grandprix...