- Arithmetic module (collaborator : Hidetoshi Marubayashi -Naruto University of Education Japan, Akira Ueda-Shimane University Japan)
- Clean module (collaborator : Nikken Prima Puspita, Universitas Diponegoro, Semarang)
- Algebraic structure in quantum cryptography (collaboration with Nanyang Technology University Singapore, Poltek SSN, Sandhiguna (a computer security company), Department of Computer Science and Instrumentation)
- Algebraic graph (collaborator : Ahmad Erfanian, Ferdowsi University of Mashhad, Iran)
- Generalized power series ring and module (collaborator : Ahmad Faisol, Fitriani, Universitas Lampung)
- Radical theory (collaborator : Puguh Wahyu Prasetyo, Universitas Ahmad Dahlan)
- Number theory (collaborator : Dr. Toh Pee Choon, NIE-NTU, Singapura dan Hong Nankun, Anhui University, China)
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Department of Mathematics
Universitas Gadjah Mada
Department of Mathematics