Rahayu, Suparni Setyowati, Department of Environmental Engineering, Universitas AKPRIND Indonesia, Indonesia
Rahmadi, Aditya Dwi, Diponegoro University (Indonesia)
Rasyid, Annurdien, Universitas Negeri Yogyakarta (Indonesia)
Rijekki, Nanda Fajar, Department of Mechanical Engineering, State Polytechnic of Malang (Indonesia)
Rosady, Siti Duratun Nasiqiati, Department of Mechanical Engineering, State Polytechnic of Malang (Indonesia)
Rosliana, Sella, Islamic University of Indonesia (Indonesia)
Rosliani, Selli, Islamic University of Indonesia (Indonesia)
Royan, Muhammad, Garuda Metalindo, Jakarta (Indonesia)
Rozy, Nikko, Swadaya Gunungjati University (Indonesia)

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