Analisis kinerja sistem pendingin arus searah (DC Cooler) sebagai upaya konservasi energi pada BTS (Base Transceiver Station) = Performance analysis of direct current cooling system (DC Cooler) as energy conservation efforts at the BTS (Base Transceiver Station) - Joessianto Eko Poetro, author (Fakultas Teknik Universitas Indonesia, 2011)