1. Polytechnic of Energy and Mineral,Oil and Gas Production Engineering,Cepu,Indonesia
2. Polytechnic of Energy and Mineral,Factory Instrumentation Engineering,Cepu,Indonesia
3. Institut Teknologi Bandung,Faculty of Mining and Petroleum Eng,Bandung,Indonesia
4. Institut Teknologi Bandung,Well Stimulation Laboratory, Faculty of Mining and Petroleum Eng,Bandung,Indonesia
5. Institut Teknologi Bandung,Radio Telecomm. and Microwave Lab., School of Electrical Eng. & Informatics,Bandung,Indonesia