Efektifitas pengolahan limbah cair dewats untuk menurunkan ammonia dan fosfat : studi kasus Rumah Sakit Bhakti Yudha Depok = Effectiveness of decentralized wastewater treatment system for reducing ammonia and phosphate : a case study of Bhakti Yudha Hospital, Depok - Sri Mahdiati, author (Universitas Indonesia, 2003)