1. Norwegian Tribology Center, Department of Mechanical and Industrial Engineering, Norwegian University of Science and Technology (NTNU), Trondheim, Norway
2. Department of Mechanical Engineering, Sepuluh Nopember Institute of Technology (ITS), Surabaya, Indonesia
3. IPN – LED & Mat – Instituto Pedro Nunes, Laboratory of Tests, Wear and Materials, Rua Pedro Nunes, Coimbra, 3030-199, Portugal
4. CEMMPRE Mechanical Engineering Department, University of Coimbra, 3030-788 Coimbra, Portugal