Irzon, Ronaldo, Ildrem Syafri, Johannes Hutabarat, and Purnama Sendjaja. 2016. “REE Comparison Between Muncung Granite Samples and Their Weathering Products, Lingga Regency, Riau Islands”. Indonesian Journal on Geoscience 3 (3):149-61. https://doi.org/10.17014/ijog.3.3.149-161.