Penentuan interval waktu penggantian komponen dan tingkat persediaan komponen truk pengangkut kelapa sawit melalui pendekatan MTTF dan pemesanan tetap dengan persediaan pengaman = The determination of time interval components replacement and inventory level for fresh fruit bunches truck transporter by MTTF and fixed time period with safety stock method - Enny Widawati, author (Universitas Indonesia, 2010)