1. Post-Doctoral Fellow, Department of Forest Product Technology, Faculty of Forestry, Universitas Gadjah Mada, Yogyakarta, Indonesia
2. Department of Forest Product Technology, Faculty of Forestry, Universitas Sumatera Utara, Deli Serdang, Sumatera Utara, Indonesia
3. Department of Forest Product Technology, Faculty of Forestry, Universitas Gadjah Mada, Yogyakarta, Indonesia
4. Laboratory of Sustainable Materials, Research Institute for Sustainable Humanosphere, Kyoto University, Uji, Kyoto, Japan