17. R. Kurniawan, G.T.M. Kadja, P. Setiawan, B. Burhan, A.A. Oktaviana, Rustan, B. Hakim, M. Aubert, A. Brumm, Ismunandar. “Chemistry of prehistoric rock art pigments from the Indonesian island of Sulawesi”. Microchemical Journal, 146, 227-233. (2019).

16. G.T.M. Kadja, N. Nurdini, N.J. Azhari, M.M. Ilmi. “Modul E-Supervision: Pembimbingan secara elektronik melalui pemanfaatan Ksype dan Google Docs”. (2019).

15. G.T.M. Kadja, M.M. Ilmi. “Indonesia Natural Mineral for Heavy Metal Adsorption: A Review”. Journal of Environmental Science and Sustainable Development, 2(2), 139-164. (2019).

14. T. Puspitasari, M.M. Ilmi, N. Nurdini, R.R. Mukti, C.L. Radiman, D. Darwis, G.T.M. Kadja. “The Physicochemical Characteristics of Natural Zeolites Governing the Adsorption of Pb2+ from Aqueous Environment”.  Key Engineering Materials, 811, 92–98. (2019).

13. L. Darmayanti, S. Notodarmojo, E. Damanhuri, G.T.M. Kadja and R.R Mukti. “Preparation of alkali-activated fly ash-based geopolymer and their application in the adsorption of copper (II) and zinc (II) ions”. MATEC Web of Conferences, 276, 06012 (2019).

12. M.K. Wardania, G.T.M. Kadja, A.T.N. Fajar, Subagjo, I.G.B.N. Makertihartha, M.L. Gunawan, V. Suendo, R.R. Mukti. “Highly crystalline mesoporous SSZ-13 zeolite obtained via controlled post-synthetic treatment”. RSC Advances, 9, 77-86. (2019).

11. W.P. Wicaksono, A.L. Marcharis, Y.P. Sari, P.W. Citradewi, G.T.M. Kadja. “High-yield co-solvent free electrochemical production of biodiesel from waste cooking oil using waste concrete as heterogeneous catalyst”. AIP Conference Proceedings, 2026(1), 020068. (2018).

10. T. Puspitasari, G.T.M. Kadja, C.L. Radiman, D. Darwis, R.R. Mukti. “Two-step preparation of amidoxime-functionalized natural zeolites hybrids for the removal of Pb2+ ions in aqueous environment”. Materials Chemistry and Physics, 2016, 197-205. (2018).

9. G.T.M. Kadja, V.A. Fabiani, M. H. Aziz, A.T.N.Fajar, A. Prasetyo, V. Suendo, E.-P. Ng, R.R. Mukti. “The effect of structural properties of natural silica precursors in the mesoporogen-free synthesis of hierarchical ZSM-5 below 100 °C”. Advanced Powder Technology, 28(2), 443-452. (2017).