MANIK, T. U.; SITORUS, T. B.; SITUMORANG, M. Performansi Pipa Bersirip Alat Penukar Kalor Udara-Tanah Menggunakan Siklus Terbuka. Jurnal Sistem Teknik Industri, [S. l.], v. 23, n. 1, p. 97–110, 2021. DOI: 10.32734/jsti.v23i1.5356. Disponível em: https://idjpcr.usu.ac.id/jsti/article/view/5356. Acesso em: 11 aug. 2025.